Bastl CASPER SOFTPOP SP2 Reference Manual
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Bastl CASPER SOFTPOP SP2 Reference Manual

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Softpop2 - reference manual draft (in progress)
Softpop2 is a radical subtractive synth with a fully analog signal path, but under unconventional
yet very musical control.
There are 4 parts of the manual:
1) Quick Start guide - please read first will be printed on the box insert+ list of button
combos (end of this document)
https://www.dropbox.com/s/6s8hfjibsvs7fx4/MANUAL%20QUICK%20SP2_TISK.pdf
?dl=0
2) Most features are described directly on the enclosure of the machine.

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Summary of Contents for Bastl CASPER SOFTPOP SP2

  • Page 1 Softpop2 - reference manual draft (in progress) Softpop2 is a radical subtractive synth with a fully analog signal path, but under unconventional yet very musical control. There are 4 parts of the manual: 1) Quick Start guide - please read first will be printed on the box insert+ list of button combos (end of this document) https://www.dropbox.com/s/6s8hfjibsvs7fx4/MANUAL%20QUICK%20SP2_TISK.pdf ?dl=0...
  • Page 2 3) Reference manual: is this document. At this point it describes everything but mostly features that might be harder to understand. The full reference manual will be an extended version of this pdf and more beginner friendly. 4) Video walkthrough/manual...
  • Page 3 QuickStart guide:...
  • Page 8 MANUAL Structure of softpop2 is as shown on the diagram. Even simplier OSC PULSE-> FILTER ->VCA...
  • Page 9 Patchbay OUTPUTS are labeled with inverted text (black in white field) INPUTS are labeled with normal text (white on black) All inputs and outputs are safe to use with modular/eurorack signals. The analog outputs (TRI, PULSE, BP, ENV, HOLD, DYNAMICS, AMP) have a bit lower levels than the standard eurorack levels, but it wont be an issue in most situations.
  • Page 10 UTILITY...

  • Page 11: Input/Output Section

    XY is a utility section. It allows you to mix two signals X and Y and crossfade between them with the knob. If only X or Y (or neither) are connected the function changes. Neither X or Y is connected: XY output gives voltage based on the position of the knob. -2 to +2 volts.

  • Page 12: Oscillator Section

    SYNC IN is external analog clock input for the sequencer. If used use the TEMPO+GATEs to set the divider/multiplier of this clock. INPUT is expecting line level signals to be processed inside the softpop. Use the INPUT fader to amplify this signal from -inf to + 26db (x20 gain). The signal is also going thru zener clipping stage so it gives nice smooth saturation.

  • Page 13: Filter Section

    TRANSPOSE input is V/OCT calibrated input that can be used to transpose the OSC pitch. Transpose is applied to the OSC after the SCALE (quantizer). It is itself quantized in semitones. User calibration implementation is planned. input is a pre-SCALE (pre-quantizer) pitch control input for the OSC. This means anything sent here will be processed by the selected SCALE before setting the pitch.
  • Page 14 FILTER IN is the input of the filter. PULSE signal is normalized to this input so by plugging another signal here will replace the OSC and the filter can be used independently. CUTOFF is voltage input to control the cutoff of the filter. It is scaled to be roughly V/OCT so it could be used to make the filter track with the oscillator.
  • Page 15 RATE input sets the speed of the envelope. It sets both the attack and decay times. TRIG input triggers the envelope. The SEQ is normalized to this input to trigger the envelope at the beginning of every step that has ENV GATE enabled. CYCLE input can activate the cycling of the envelope when positive voltage applied.

  • Page 16: Sequencer Section

    SEQUENCER section RESET input will reset the sequencer to the first step when it detects the rising edge of a gate or voltage. It will also advance the SCALE chain. Use it with the available sequencer gates to shorten the sequence to any number of steps. CV is the voltage output of the sequencer.
  • Page 17 ENV RATE fader sets the speed (same with RATE CV in) ENV SHAPE fader sets proportion between attack and decay ENV CYCLE switch turns ENV into LFO (CYCLE patch input only works if the switch is off/down) REVERSE gate input should invert the attack and decay proportion of the ENV set by the ENV SHAPE fader Filter FILTER has CUTOFF and RESONANCE faders to set the filter, MOD fader is an attenuator for...
  • Page 18 TEMPO (Clock) SEQ is clocked by the TEMPO section SEQ is stopped and deactivated by single press of PLAY button TEMPO is set by tapping TEMPO button or adjusted by TEMPO + UP/DOWN If SYNC IN jack is used it takes over the internal TAP TEMPO clock Internal tempo can be overridden by midi clock: MIDI_B+PLAY to activate/deactivate SEQ is CLOCKed after divider/multiplier set by TEMPO+GATE (gate 5 is the default 1/1 clock) Sequencer...

  • Page 19: Play Modes

    SEQ has GATE per step that triggers ENV SEQ has SLIDE per step that activates slew on the pitch SEQ can store chain of PATTERNs SEQ can store chain of SCALEs SEQ ENV GATE is high when the Envelope gate is used in the sequencer SEQ CV outputs v/oct version of the sequencer pattern SEQ GATE is a gate that triggers ENV SEQ SLIDE GATE is gate when the OSC is slewed...

  • Page 20: Step Edit Mode

    1-Tremolo - switching the VCO rhythmically to LFO range (affected by TRIG FXs) 2-Fast TRIG 3-Slow TRIG - combine with fast TRIG to get 3rd speed ratchet 4-Fast 4 Octave Arpeggio - combine with TRIG FXs to change speed 5-Pitch Envelopes - combined with 6 makes less depth 6-Long Slew 7-Noise VCO modulation (affected by all fx bellow) - combined with 6 makes deeper noise 8-Silencer-switches the VCO to LFO mode and mutes all envelope triggers...
  • Page 21 SCALE+TEMPO+UP/DOWN = transpose whole scale up/down by a semitone XY utility section is a crossfader between X any Y signals. -Use it to mix 2 signals together (dry/wet, OSC mix etc.) -there are normalised signals on the X and Y inputs -use none of the X &...

  • Page 22: Sample & Hold

    Sample & Hold S&H circuits is triggered by ENV or can by triggered externally S&H circuits samples TRIangle waveform of the OSC so in sub-audio you can achieve stepped LFOs Input INPUT brings external gear and can process this signal. Use INPUT fader for amplification. AMP jack is amplified version of the external signal (can by used for DRY/WET in the XY section of for modulation something) DYNAMICS is envelope followed signal of the INPUT and can be used to modulate and trigger...

  • Page 23: Firmware Upload

    MIDI+PATTERN will activate Midi Velocity to be reflected on the SEQ CV output instead of the sequence. midi pitchbend and midi ccs are not implemented yet Light orb is a signature casper thingy and it visualises what is happening. Put your phone camera as close as possible to get some glitchy visuals! Turn Orb off with a switch if you need darkness Firmware upload:...
  • Page 24 8) Set SLIDE time to 1 (no slide) and use the SLIDE GATE to modulate stuff 9) Use gates to modulate CV inputs (especially POP, REVERSE, VOLUME, CYCLE) 10) Patch any gate to INPUT and use DYNAMICS out as a simple envelope to modulate stuff 11) Patch ENV to OSC MOD and enjoy some arpeggios, stop sequencer and patch EDGE to RESET to browse through chained scales...
  • Page 25 Output amplitudes: OUTPUT 5Vpp TRI 5Vpp PULSE 3.5Vpp unipolar BP 4Vpp EDGE 3.5Vpp unipolar ENV 4Vpp unipolar SAMPLE & HOLD 5Vpp DYNAMICS 4Vpp unipolar AMP 7Vpp XY 4Vpp Gate/Clock outputs 0 to 5V CV output -3 to +3V Features...
  • Page 26 Fully analog signal path with integrated digital control Patchbay with 37 eurorack compatible patch-points for ultra-flexibility Light orb for psychedelic inspiration Triangle core oscillator with PWM input and pulse and triangle outputs Automatic oscillator tuning and octave-wide fine-tune control Quantized V/OCT semitone transpose State variable resonant filter with lowpass, bandpass, and highpass modes POP control for unique subtle and distorted timbres Flexible attack-decay cycling Envelope with a ton of control inputs...
  • Page 27 Downloads: Quickstart guide Reference manual (in progress) pdf Media files (hi-res pictures, wallpapers etc.) drive Latest firmware Eurorack adaptor gitHub Not implemented yet User calibration of TRANSPOSE IN User calibration of CV out Midi out implementation (for hacking) Midi recording...

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