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twisted electrons TherapSid MKII User Manual

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TherapSid MKII
User Manual
June 2017
1 of 18



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  Summary of Contents for twisted electrons TherapSid MKII

  • Page 1 TherapSid MKII User Manual June 2017 1 of 18...
  • Page 2 Thanks! Overview Thank you for adopting Therapsid2, the ultimate SID synth! About the SID chip: MOS Technology 6581/8580 SID (Sound Interface Device) is the built-in Programmable Sound Generator chip of Commodore's CBM-II, Commodore Commodore 128 Commodore MAX Machine home computers. It was one of the first sound chips of its kind to be included in a home computer prior to the...
  • Page 3 1- Connectivity & Power (rear view) TherapSid features from right to left DC input 15V 1/8” audio inputs and outputs for both chips CV pitch input, Gate input (only active when in monophonic mode) MIDI input & output 3 LFO override CV inputs The Audio in enables you to run any audio signal through the SID’s filter path.
  • Page 4 2-1 Load Press the up/down buttons to scroll through the presets. Preset number appears on the display. 2-2 Save You can store the current sound to any preset slot: 1: Press both preset up and down buttons simultaneously activate save mode. 2: The destination slot number will flash, press preset up or down to choose a destination slot.
  • Page 5: Pulse Width

    3- Voice Section Therapsid’s 3 voices are laid out across the top half of the control panel. The 3 voice strips are identical in functionality, explained from left to right: 3-1 Waveforms Each voice each consists of 4 waveforms: Square,Triangle,Sawtooth and Noise. Press the corresponding button to enable or disable a waveform (indicated by LED).
  • Page 6: Ring Mod

    3-5 Paraphonic Mode You can activate paraphonic ( 3 voice) mode at any time by holding a waveform button on voice 1 for 4 seconds. The LED displays PA indicating Paraphonic mode. Voices 2 and 3 and now mirror the parameters of voice 1 but can also be changed individually.
  • Page 7 3-8 Volume Envelopes ADSR The "attack" and "decay" of a sound have a great effect on the instrument's sonic character. ADSR envelope is specified using four parameters: • Attack time is the time taken for initial run-up of level from nil to peak, beginning when the key is first pressed.
  • Page 8: Lfo Modulation

    4- Filter The SID chips are equipped with a multimode resonant filter. The filter is the analog section of the circuit and its warm/dirty sound is what give the SID its authentic character. 4-1 Filter Modes Press the filter button to toggle through the 4 filter states: Off, Low Pass, Band Pass, High Pass, Low Pass+ High Pass (notch) 4-2 Cutoff The cut knob adjusts the filter cutoff frequency...
  • Page 9: Lfo Waveforms

    Therapsid has 3 LFOs to bring your synth to life! Note: the LFO values are also sent as midi CCs so you can modulate other synths with therapSid 5-1 LFO Waveforms There are 4 LFO shapes to choose from: Square, Triangle, Saw, Noise and Env3 (ADSR envelope of voice 3). -Move either of the 3 LFO’s depth or rate knobs to select that LFO.
  • Page 10 linked to your target knob To unlink the LFO, simply press the link button again. The chain icon will go dark again. Note: You can assign multiple knobs to the same LFO! 5-3 Re-trigger & Loop The LFOs don’t necessarily have to loop, you can also use them as “one shot” envelopes, useful for pitch decay of percussive sounds for example.
  • Page 11 Therapsid MKII has a brand new arpeggiator that is easy to use but can become wild when modulated by LFO! When active, the arpeggiator re-triggers LFOs The arpeggiated notes are also transmitted via MIDI 6-1 Arp Modes The arpeggiator has five modes: OFF, UP, DOWN, UP/DOWN, RANDOM press the mode button to toggle through the available modes (displayed on the 7 segment LED display).
  • Page 12: Midi Channel Selection

    7- MIDI TherapSid can transmit and receive MIDI. A little dot at the right of the first LED digit indicates incoming MIDI, a dot at the right of the second LED digit indicates outgoing MIDI 7- 1 MIDI Channel Selection TherapSid can receive and send MIDI on the channel of your choice.
  • Page 13 7- 3 MIDI Controller Implementation Note: the knobs and buttons (AND LFOs!) send their corresponding MIDI CCs out too, so you can double therapSid as a powerful MIDI controller for other synths! MIDI Message Range Result Direction Note On/Off CH1 1-127 Trigger Voices Unison receive/send...
  • Page 14 MIDI Message Range Result Direction Control CC#2 1-127 Voice1 Pulse Width receive/send Control CC#10 1-127 Voice2 Pulse Width receive/send Control CC#18 1-127 Voice3 Pulse Width receive/send Control CC#4 1-127 Voice1 Fine receive/send Control CC#12 1-127 Voice2 Fine receive/send Control CC#20 1-127 Voice3 Fine receive/send...
  • Page 15 MIDI Message Range Result Direction Control CC#49 0-64=0 65-127=1 Voice1 Sync receive/send Control CC#50 0-64=0 65-127=1 Voice1 Ring receive/send Control CC#51 0-64=0 65-127=1 Voice2 Sync receive/send Control CC#52 0-64=0 65-127=1 Voice2 Ring receive/send Control CC#53 0-64=0 65-127=1 Voice3 Sync receive/send Control CC#54 0-64=0 65-127=1...
  • Page 16: Firmware Updating

    8 - Firmware updating Therapsid supports firmware updates via MIDI system exclusive messages (sysex). The firmware version is displayed for 1 second on the 7segment led display during startup. Please check the therapSid page online for the latest firmware: To enter update mode aka boot-loader: -unplug the unit’s power cord.
  • Page 17 9 Multi SID Although TherapSid is fully functional with a single SID chip. TherapSid MKII now supports a second chip. There are 4 Fat Modes to better take advantage of the dual chip setup: To toggle through the Fat Modes, hold arp mode for 3 seconds.
  • Page 18 10 SID Access and Configuration Ensure that therapSid is powered OFF. Unscrew the 4 screws and remove the trap door to access the SID chip(s). Each chip has 3 setting jumpers. All 3 jumpers need to be either positioned LEFT or RIGHT according to SID type: Carefully follow the instructions on the back of the trap door as follows: 6581: Position all jumpers on the LEFT (pins 1-2 of the jumper sockets)
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