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Jomox Mod FM User Manual

8 voice 4 op fm synth
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Summary of Contents for Jomox Mod FM

  • Page 1 User ManUal Preliminary Version Will be updated soon. Please check frequently. www.jomox.de...
  • Page 2 JoMoX elektronische Musikinstrumente GmbH sophie-Charlotte-str. 15 14059 Berlin...

  • Page 3: Table Of Contents

    Content Intro What is Mod FM? Installation / rack Mounting operating Panel Control Elements and Displays Editing Parameters Changing Presets Connection Sockets soUnD GeneratIon signal Path overview FM Engine (Experimental Field and Key to outstanding Timbres) Analogue Processing (Efficient Parameters with real analogue Flavor) Effects Section (Adding sonic Spice)

  • Page 4: Intro

    We pray to you: Please read (and internalise) the f... manual! You will do your- self a big favour, because it will (hopefully) help you to find a quick access to your new Mod FM. and that means: more and faster fun with your new synthe- sizer. sounds good, eh...? thank you so much! INTRO...

  • Page 5: Installation / Rack Mounting

    Installation / rack Mounting Please power off your eurorack prior to installation! On the backside of the Mod FM module you can find this connector: Rack Mounting Please connect the included ribbon cable to the Eurorack system bus rails as shown on the pictures. The Mod FM module needs +/-12 Volts at a supply current of maximum 130mA on +12V and about 70mA on -12 Volts. The optional 5 Volts and the CV/Gate on the A-100 Doepfer bus are both not wired inside the Jomox module and not needed. Other 10 pin systems may be used as well if only the lower part of the 16 pin connector is connected. Please pay attention for the position of the voltages and the ground pins! The printed voltage information have to match, please check the wires again and make sure no pin is left or bent.
  • Page 6 The JoMoX Mod FM euro rack supply connector. Please connect the power supply of the eurorack system bus here. attention: Do not connect, under any circumstances, the power supply cable to the Jomox Inter-D-module bus!!! the rack power supply and the module could get seriously damadged! Then please mount the module on the rack rails using the supplied metric M3 screws. The rack mounting is now completed and Mod FM ready to play. INTRO JoMoX Mod FM...

  • Page 7: Operating Panel

    Displays: Both displays provide information about operating states and parameter settings. They basically show several pieces of information and parameters at the same time, summarised on menu pages. To make it easier to find your way around the display contents, the following display modes apply (please refer to the figure on the next page): • On all pages of the left display, the top line shows the current preset name and number. • Names of menu pages are shown inverted and are usually located in the top right-hand corner of the left-hand display. • An editable parameter is shown with a shortened name (e.g. FrQ) and a little knob symbol. • The position of the slider mark roughly shows the current parameter value. • If a parameter controls a signal level, a little bar is displayed instead of the knob symbol. • When the corresponding knob is turned, the display briefly shows the parameter value as a number instead of the shortened parameter name. • Some display pages - such as envelope curves - are animated and change their shape according to the corresponding parameter values. JoMoX Mod FM JoMoX Mod FM INTRO...

  • Page 8: Editing Parameters

    Turn Knob Display shows Parameter Value Example for the right Change handed display: Parameter Value Level Parameter WAV01 Turn Knob Any other Parameter Display shows Parameter Value To optimise the live span of the displays, a screen saver switches on after 30 seconds without an input. Touching any control element calls up the normal display again. INTRO JoMoX Mod FM...

  • Page 9: Changing Presets

    On the far left and bottom left are CV inputs for external control of sound parameters. They handle control voltages from 0V to 5V. • CV/Gate At the bottom are CV/gate inputs for pitch and trigger of all eight voices. Mod FM handles gate signals of 3V to 15V, according to the Eurorack standard. the control voltage inputs and the CV/Gate inputs of the Mod FM are compatible with the eurorack standard and should only be operated with signals from suitable eurorack modules! MIDI Ports External Control of...

  • Page 10: Sound Generation

    • pitch and volume envelope amount of each operator (eV/oP CV sockets) • modulation amounts between each operator (amt 1 – 4 sockets) • pitch of each operator (FM1 – 4 +/- sockets) The figure on the following page shows a simplified representation of Mod FM’s entire sound generation. lots of information about FM sound synthesis can be found on the internet. SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 11: Signal Flow

    Signal Flow (simplified) Operator 1 VCO Out periphericals in detail LFO1 LFO2 (FM) (AM) FM Envelope ext. CV AM Envelope ext. CV FM Engine FX Section Delay 1 Analogue Reverb Section Delay 2 JoMoX Mod FM SOUND GENERATION...

  • Page 12: Menu Overview

    NO ALGORITHM display FREE MATRIX Analog Bass 1012 Analog Bass 1012 LFO 1 LFO2 left-hand display LFO1 FM LFO2 LFO1 FM LFO2 right-hand display Analog Bass 1012 Filter FIL/VCA left-hand display right-hand display WAV01 SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 13: Fm Engine

    The four diagonally positioned matrix knobs “oP1” to “oP4” control the frequencies (pitches) of the four corresponding operators. Operator pitches are generally tuned in semitones by default. In the so-called overtone mode, the operators are tuned according to the overtone series (see below). The remaining 12 matrix knobs (“amt XY”) control the intensity of all modulation paths between the operators (“FM1” to “FM4”). The numbers correspond to the modulation paths, i.e. “Amt31” determines the modulation intensity from operator 3 to operator 1, “Amt24” that from operator 2 to operator 4, etc. In matrix mode, the left display visualises the matrix, depending of the currently selected algorithm. Together with the matrix knobs, it is used for programming the modulation paths within the matrix. Depending on the selected display page, the right display shows a schematic representation of the operator volume- or pitch envelopes. Analog Bass 1012 MATRIX OVT0 AL00 VOL Matrix Mode Matrix Mode left Display right Display JoMoX Mod FM SOUND GENERATION...

  • Page 14: Operators

    • LFO1 (=> resulting in periodical sound changes) - editing with LFO menu / LFO1 page Modulation of the operator volume by • AM envelope (=> resulting in volume progression) - editing with Matrix menue / AM envelope page • LFO2 (=> resulting in periodical volume change) - editing with LFO menu / LFO2 page Above that, both the modulation depths between the operators and those of envelopes and LFOs can be controlled with the help of external voltages. The interaction of the various modulation sources allows highly complex and dynamic timbres to be created. The following figure shows the various interconnections and modulation sources to control pitch and volume of each operator: LFO1 LFO2 (FM) (AM) FM Envelope AM Envelope Amt 12 ext. CV ext. CV Amt 21 SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 15: How To Operate The Matrix

    • C1/M1 to C4/M4: Pitch of the operators 1 to 4 – Depending on the selected algorithm, the individual operators work either as carriers (C) or as modulators (M). • amtXY: Amount XY (shown in the display as a knob symbol) – Modulation intensities between the operators. • tUn: Tuning – Base pitch of the entire FM engine. • oVt: Overtone – Selects the overtone mode of the operators (overtone function). This overtone function scales the operators to harmonic overtones and thus simplifies the pro- gramming of tonally playable sounds. To understand exactly how it works, we have to dive a bit deeper (To use the overtone function, you do not have to fully understand it – but knowledge doesn’t hurt...): In the “usual case” (i.e. OVT 0), all four operators receive the same basic pitch via MIDI or CV. In addition, they can be detuned independently of each other in semitones over a wide range with the help of the matrix knobs OP1 to OP4. However, harmonics are hit only “occasionally” (i.e. whole- number frequency ratios between the operators) - and only then, harmonic and tonally playable sounds are produced. To simplify the creation of harmonic sounds, Mod FM has its overtone mode in which the operators provide exclusively harmonic overtones. To achieve that, the “overtone operators“ (OT) are decoupled from the fundamental (Midi, CV) and synchronised (resp. set into relation) to the “base tone operators“ (BT) instead. When turning the matrix knobs OP1 to OP4 the operators now deliver exclu- sively harmonic overtones. All intermediate, inharmonic frequencies are omitted. The overtone mode offers six different settings resp. interconnections of fundamental- and overtone operators (settings OVT 1 to OVT 6). Each of these six settings provides a different harmonic selec- tion, resulting in different timbres. This works with the free matrix and all FM algorithms. JoMoX Mod FM SOUND GENERATION...
  • Page 16 (Key CV / MIDI) The following figure shows the synchronisation between the basetone- and overtone operators in the different overtone modes 0 to 6. In mode “0” is no sync between the operators (see above). BASE / OVERTONE BASE / OVERTONE BASE / OVERTONE STRUCTURE STRUCTURE STRUCTURE BASE / OVERTONE BASE / OVERTONE BASE / OVERTONE STRUCTURE STRUCTURE STRUCTURE BASE / OVERTONE STRUCTURE SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 17: Algorithm Menue

    OPERAT TUNE MODE “operator tune Mode”. The left displsy shows: • Para 1 to Para 4 knobs now allow toggling between two different tuning modes per operator: • tUn: Operator is tuned in semitones. This is the usual operation mode as we know (and love) it. • FrQ: Operator is tuned to a fixed frequency (in Hertz) that is selected with the corresponding matrix knob (oP1 to oP4). Now the operator is unable to work in any overtone modes (because its frequency is fixed). It neither reacts to incomming note information. This mode is especially useful for inharmonic and noisy sounds. JoMoX Mod FM SOUND GENERATION...

  • Page 18: Operator Envelopes

    VO 2 / FM 2 000 - 127 Para 2 OP 2 Envelope Mod-Amount VO 3 / FM 3 000 - 127 Para 3 OP 3 Envelope Mod-Amount VO 4 / FM 4 000 - 127 Para 4 OP 4 Envelope Mod-Amount SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 19: Lfo Menue

    LFO Frequency (LFO Mode) VCO Detune (VCO Mode) 000 - 127 Para 2 VCO Audio Level in Signalpath LFO / VCO LFO / VCO Para 3 LFO / VCO Mode 00 - 63 Para 4 Waveshape OCT (right Display) 0 - 6 Matrix Knobs 2, 3, Row 1 Octave Pitch (VCO Mode only) JoMoX Mod FM SOUND GENERATION...
  • Page 20 • lFo / VCo: Operating mode - toggles between LFO and VCO mode. When set to VCO, the corresponding oscillator works in the audio range and can be used as an additional sound source, together or alternatively to the FM engine. • WaV: Waveform – there are 64 different waveforms to choose from in both modes. In VCO mode, there is one more function available in the right display: • oCt: Octave – selects the octave position of the VCO in a range of seven octaves (0 - 6) Analog Bass 1012 VCO1 VCO2 MX LFO 1 etc. OCT 3 OCT 5 Both LFO 1 and LFO 2 in VCO Mode Para 1 Para 2 Para 3 Para 4 SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 21: Sound Processing

    The modulation is done with one ADSR envelope each for timbre (Filter) and volume (VCA) progressions as well as with one more LFO that modulates the filter cutoff. There is also a noise generator with selectable sound characteristics as a further signal source. FM engine, VCOs and noise generator can be mixed in any ratio. These signal levels (INP / Input) can overdrive the filter input stage, if desired. This creates saturation effects or distortion that can be used to shape the sound. The filter is a resonant multimode filter. Its characteristics (SHP / Shape) can be blended continously between low-pass (LP), band-pass (BP) and high-pass (HP). It also works as a 2-pole and as a 4-pole filter. The two corresponding outputs can be mixed continously (MIX). The Filter button opens the Filter/VCA menu. The parameters are distributed over both displays. They are each arranged in three lines with up to four parameters. The following figure shows the assignement of knobs and functions: Analog Bass 1012 FIL/VCA Para 1 Para 2 Para 3 Para 4 JoMoX Mod FM SOUND GENERATION...
  • Page 22 • aDsr F(ilter): The second row of matrix knobs controls the parameters A, D, S and R of the filter envelope. • aDsr V(CA): The third row of matrix knobs controls the parameters A, D, S and R of the volume envelope. The following parameters are available in the right-hand display: Input - Sets the level ratio of the signals at the filter input stage: • FMV: FM Volume - level of the FM engine • noI: Noise - level of the noise signal • Met: Metallic - sound character of the noise signal Mixer - Sets the level ratio of the filter’s output signals: • 2Pl: 2-pole - output level of the 2-pole filter • 4Pl: 4-pole - output level of the 4-pole filter shape - sets the characteristics of the filter: • lP / BP / HP: The filter blends continuously between low-pass (LP), band-pass (BP) and high-pass (HP). When the Para 1 knob is turned, the display briefly shows a value, then returns to the selected characteristics (LP, BP or HP). SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 23: Effects (Fx)

    Analog Bass 1012 REVERB Display Content Value Knob / Button Function 000 - 127 Para 1 Level Reverb Signal 000 - 127 Para 2 Reverb Decay Time 000 - 127 Para 3 Hi Cut 000 - 127 Para 4 Lo Cut JoMoX Mod FM SOUND GENERATION...
  • Page 24 Para 3 Delay Time Range / MIDI Sync 000 - 127 Para 4 Delay Feedback • BPM: Beats per Minute – shows delay time in beats per minute (BPM) when Mod FM ist synced to an external MIDI clock signal (no editable value). • leV: Level - sets the level of the delay signal. • DlY: Delay – selects the delay time, i.e. the time interval between the throws back. The Para 2 knob first sweeps a range of values from 000 to 127, after which note values (1/2 to 1/64 triplet) appear. If Mod FM receives an external MIDI clock, both delays automatically synchronise to it. Then these note values determine the desired clock divider. • Para 3: If DlY (Para 2) shows a numerical value (000 - 127), the three delay time ranges SLOW, MED(ium) and FAST can be selected here. If DlY shows a note value, (clock divider) e.g. 1/16, the delay time is synchronised to an external MIDI clock and the display shows SYN here. The display also shows the MIDI clock tempo in BPM. • FBK: Feedback - sets the number of reflexions (echo). SOUND GENERATION SOUND GENERATION JoMoX Mod FM...

  • Page 25: Randomisation And Reset Functions

    • Press and hold the < Cursor button for at least 3 seconds. The current settings of the filter are randomised. The other settings (FM engine, FX etc.) are not randomised. The display shows: Filter randomizd Initialise single Preset • Press and hold the sing/Mul button for at least 3 seconds. The current Single preset is entirely initialised, i.e. all its sound engine parameters are reset to their basic settings. Preset initialzd JoMoX Mod FM SOUND GENERATION...

  • Page 26: Single-/Multimode

    Multi Mode 016 I 006 I 003 I 004 I 005 I 007 I 003 I In multi-mode, each voice of the Mod FM can be assigned its own single preset. The combination of up to eight single presets forms a multi-preset. Multi presets can be stored. Mod FM stores up to 128 multi presets. Each voice is controlled via its own pair of CV/gate sockets (as in single mode). When controlled by MIDI, two different note assignement modes are available. They can be accessed in the MIDI menue, page 2, function Splt 0/1 (“Split”). Please refer to page 30.
  • Page 27 Single Preset Unlike some other multi mode capable synthesizers, the multi mode memory of Mod FM contains copies of the respective single presets. that means that editing individual sounds in multi mode has no effect on the corresponding single presets.

  • Page 28: Store Presets

    Character Change Select Preset Character Location again: attention please - there is no UnDo! sounds that have been overwritten are irretrievably lost! no exceptions... • Pressing the < Cursor button cancels the storing process. STORE / RECALL JoMoX Mod FM...

  • Page 29: External Control

    Analog Bass 1012 Midi Setup 1 RxCh CkSy TxCh PBRg • rxCh: Receive Channel - Selects the midi receive channel between 01 and 16 • txCh: Transmit Channel - Selects the Midi transmit channel between 01 and 16 • Cksy: Clock Sync - Receive and send Mídi clock data on/off • PBrg: Pitchbend-Range - Determines the range of received pitchbend data in semitone steps: 0 = no pitchbend to 24 = +/- 1 octave MIDI setup 2: Analog Bass 1012 Midi Setup 2 Splt TxCC TxTr RxTr JoMoX Mod FM EXTERNAL CONTROL...
  • Page 30 MIDI Setup 3 is used for SysEx data transmission of the the Mod FM presets. Turning a Para 1 - 4 knob starts the corresponding data transmission. While sending, the display shows “BUSY”. When the transmis- sion is completed, it shows briefly “DONE”. Then the display returns to its standard setting “OFF”. Analog Bass 1012 Midi Setup 3 SysEx Transmit 1Prs 1Mu1 BlkP BlkM • 1Prs: SysEx dump of the current single preset. • BlkP: SysEx dump of all single presets • 1Mul: SysEx dump of the current Multi-Preset • BlkM: SysEx dump of all multi-presets MIDI setup 4: Analog Bass 1012 Midi Setup 4 MiTh MiUB EXTERNAL CONTROL JoMoX Mod FM...
  • Page 31 • MitH: MIDI Through - Enables/disables the MIDI Through function of the MIDI In/Out sockets in order to avoid MIDI loops in your setup. • MiUB: MIDI-USB Through - Enables/disables the MIDI Through function of the USB port in order to avoid MIDI loops in your setup. JoMoX Mod FM EXTERNAL CONTROL...

  • Page 32: External Control Via Cv/Gate And Control Voltages

    • sCl: Scale - changes the octave spread (Scaling) Modulation with external control voltages The modulation depths between the four FM operators in the matrix as well as the operator pitches can be controlled with the help of external control voltages. According to the Eurorack standard, voltages in the range of 0 volts to +5 volts are processed. external control of matrix modulation depth The modulation depth that acts on an operator is added from the sum of the individual amounts involved, depending on the algorithm used (amt knobs). For this purpose, an external control voltage (positive) can be added per operator (sockets amt 1 - 4). Its effect can be determined in the set FM amt menu for each operator. EXTERNAL CONTROL JoMoX Mod FM...
  • Page 33 OP Mod Amt Attenuator total Mod Amt (100%) The set FM amt button opens the corresponding menu. The left display shows: OPMOD The lower four Matrix knobs now set: • oP1: Operator 1 - Effect of the external control voltage at socket Amt 1 on Operator 1. • oP2: Operator 2 - Effect of the external control voltage at socket Amt 2 on Operator 2. • oP3: Operator 3 - Effect of the external control voltage at socket Amt 3 on Operator 3. • oP4: Operator 4 - Effect of the external control voltage at socket Amt 4 on Operator 4. external control of operator pitches The pitches of the four operators can be controlled by external control voltages (-5V to +5V). The sockets FM 1 +/- to FM 4 +/- are used for this purpose. The external control voltages are added to the pitches set with knobs OP 1 - 4. JoMoX Mod FM EXTERNAL CONTROL...
  • Page 34 • oP4: Operator 4 - Effect of the external control voltage at socket FM 4 +/- on Operator 4. external control of the operator envelopes The modulation depths of the four operator envelopes (in the matrix menu, display page 2, 3) can be controlled with external control voltages (positive). The four ENV/OP CV sockets are used for this purpose. The control voltages applied there are first attenuated and then added to the modulation depths set with the Para 1 - 4 knobs (matrix menu, display page 2, 3). The desired attenuation is done with the help of the settings in the Set EV/OP menu. EV/OP CV CV Attenuator Operator Socket (Set EV/OP Menue) FM Envelope Att. AM Envelope Att. EXTERNAL CONTROL JoMoX Mod FM...
  • Page 35 OP 1 The left two columns of the matrix matrix knobs now determine the attenuation of the external control voltage for the envelope amount of volume/AM and pitch/FM of the four operators. • oP1: Operator 1 - Effect of the external control voltage at socket EV/OP CV 1 on AM/FM envelope amount of Operator 1. • oP2: Operator 2 - Effect of the external control voltage at socket EV/OP CV 2 on AM/FM envelope amount of Operator 2. • oP3: Operator 3 - Effect of the external control voltage at socket EV/OP CV 3 on AM/FM envelope amount of Operator 3. • oP4: Operator 4 - Effect of the external control voltage at socket EV/OP CV 4 on AM/FM envelope amount of Operator 4. JoMoX Mod FM EXTERNAL CONTROL...

  • Page 36: Addendum

    Analog Bass 1012 ALG 00 MATRIX NO ALGORITHM FREE MATRIX OVT0 AL00 VOL Analog Bass 1012 ALGO1 MATRIX OVT0 AL01 VOL Analog Bass 1012 ALGO2 MATRIX OVT0 AL02 VOL Analog Bass 1012 ALGO3 MATRIX OVT0 AL03 VOL APPENDIX JoMoX Mod FM...
  • Page 37 MATRIX OVT0 AL04 VOL Analog Bass 1012 ALGO5 MATRIX OVT0 AL05 VOL Analog Bass 1012 ALGO6 MATRIX OVT0 AL06 VOL Analog Bass 1012 ALGO6 MATRIX OVT0 AL06 VOL Analog Bass 1012 ALGO7 MATRIX OVT0 AL07 VOL JoMoX Mod FM APPENDIX...
  • Page 38 MATRIX OVT0 AL08 VOL Analog Bass 1012 ALGO9 MATRIX OVT0 AL09 VOL Analog Bass 1012 ALG10 MATRIX OVT0 AL10 VOL Analog Bass 1012 ALG11 MATRIX OVT0 AL11 VOL Analog Bass 1012 ALG12 MATRIX OVT0 AL12 VOL APPENDIX JoMoX Mod FM...
  • Page 39 MATRIX OVT0 AL13 VOL Analog Bass 1012 ALG14 MATRIX OVT0 AL14 VOL Analog Bass 1012 ALG15 MATRIX OVT0 AL15 VOL Analog Bass 1012 ALG16 MATRIX OVT0 AL16 VOL Analog Bass 1012 ALG17 MATRIX OVT0 AL17 VOL JoMoX Mod FM APPENDIX...
  • Page 40 MATRIX OVT0 AL18 VOL Analog Bass 1012 ALG19 MATRIX OVT0 AL19 VOL Analog Bass 1012 ALG20 MATRIX OVT0 AL20 VOL Analog Bass 1012 ALG21 MATRIX OVT0 AL21 VOL Analog Bass 1012 ALG22 MATRIX OVT0 AL22 VOL APPENDIX JoMoX Mod FM...
  • Page 41 MATRIX OVT0 AL23 VOL Analog Bass 1012 ALG24 MATRIX OVT0 AL24 VOL Analog Bass 1012 ALG24 MATRIX OVT0 AL25 VOL Analog Bass 1012 ALG24 MATRIX OVT0 AL25 VOL Analog Bass 1012 ALG26 MATRIX OVT0 AL26 VOL JoMoX Mod FM APPENDIX...

  • Page 42: Technical Specifications

    Technical Specifications APPENDIX JoMoX Mod FM...

  • Page 43: Imprint

    - Generic emission standard on residential, commercial and light industry. Compliance with these require- ments provides a reasonable level of assurance that the use of this product in a residential environment will not result in harmful interference with other electronic devices. Disposal This device complies to the eu guidelines and is manufactured roHs conform without the use of led, mercu- ry, cadmium and chrome. still, this device is special waste and disposal in household waste is not permit- ted. For disposal, please contact your dealer or: Copyright Copying, distribution or any commercial use in any way is prohibited and needs the written permission by the manufacturer. Specifications subject to change without notice. Although the content of this owners manual has been thoroughly checked for errors, JoMoX GmbH cannot guarantee that it is error-free throughout. JoMoX GmbH cannot be held liable for any misleading or incor- rect information within this guide. All rights reserved ©2023 JoMoX GmbH JoMoX elektronische Musikinstrumente GmbH sophie-Charlotte-str. 15 14059 Berlin...

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