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3-8 Volume Envelopes ADSR

 

The "a]ack" and "decay" of a sound have a great effect on the instrument's 
sonic character. ADSR envelope is specified using four parameters: 

AIack 9me

 is the Dme taken for iniDal run-up of level from nil to peak, 

beginning when the key is first pressed. 

Decay 9me

 is the Dme taken for the subsequent run down from the 

a]ack level to the designated sustain level. 

Sustain level

 is the level during the main sequence of the sound's 

duraDon, unDl the key is released. 

Release 9me

 is the Dme taken for the level to decay from the sustain 

level to zero a`er the key is released. 

  

                                                           

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Summary of Contents for TherapSid MKII

Page 1: ...TherapSid MKII USER MANUAL January 2018 of 18 1...

Page 2: ...rface Device is the built in Programmable Sound Generator chip of Commodore s CBM II Commodore 64 Commodore 128 and Commodore MAX Machine home computers It was one of the rst sound chips of its kind t...

Page 3: ...or both chips CV pitch input Gate input only acDve 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 lter path Thera...

Page 4: ...n slot number will ash press preset up or down to choose a desDnaDon slot 3 Press both preset up and down bu ons to save 2 3 Preset reset Press reset to return to preset 1 at any Dme 2 4 Preset random...

Page 5: ...a waveform indicated by LED Note MulCple waveforms can be acCve at the same Cme 3 2 Pulsewidth The pw knob adjusts the duty cycle of the square waveform Note this has no e ect on the other waveforms o...

Page 6: ...ng Hard Sync e ects Varying the frequency of Oscillator 1 with respect to Oscillator 3 produces a wide range of complex harmonic structures from Voice 1 at the frequency of Oscillator 3 In order for s...

Page 7: ...l run up of level from nil to peak beginning when the key is rst pressed Decay 9me is the Dme taken for the subsequent run down from the a ack level to the designated sustain level Sustain level is th...

Page 8: ...its authenDc character 4 1 Filter Modes Press the lter bu on to toggle through the 4 lter states O Low Pass Band Pass High Pass Low Pass High Pass notch 4 2 Cuto The cut knob adjusts the lter cuto fre...

Page 9: ...ons to change the selected LFO s shape You can also assign no shape at all by pressing a readily lit shape In this case the LFO s depth knob becomes a manual controller 5 2 Assigning LFOs to knobs Th...

Page 10: ...p 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 The LFOs can also be re triggered on every key press Press...

Page 11: ...UP DOWN RANDOM press the mode bu on to toggle through the available modes displayed on the 7 segment LED display 6 2 Scrub You can use the scrub knob to jog through the arpeggiator notes This is parD...

Page 12: ...DI input channel 1 16 with the Preset Up Down bu ons When done con rm with a nal press of the Arp Mode bu on Display goes blank and the channel is saved to EEPROM To select MIDI output channel Hold Ar...

Page 13: ...SEX Hold Preset Down during startup The SYSEX is automaDcally sent out of the MIDI port To receive SYSEX Hold Preset Up during startup TherapSid will enter SYSEX receive mode indicated Re on the LED d...

Page 14: ...eive send Control CC 8 1 127 Voice1 Sustain receive send Control CC 9 1 127 Voice1 Release receive send Control CC 14 1 127 Voice2 Attack receive send Control CC 15 1 127 Voice2 Decay receive send Con...

Page 15: ...5 1 127 Voice1 Glide receive send Control CC 13 1 127 Voice2 Glide receive send Control CC 21 1 127 Voice3 Glide receive send Control CC 34 1 127 Arp Scrub receive send Control CC 35 1 127 Arp Rate r...

Page 16: ...65 127 1 Voice1 Saw receive send Control CC 40 0 64 0 65 127 1 Voice1 Noise receive send Control CC 41 0 64 0 65 127 1 Voice2 Rect receive send Control CC 42 0 64 0 65 127 1 Voice2 Triangle receive s...

Page 17: ...nel will be lit indicaDng that boot loader mode is acDve and ready to receive the sysex from your computer 8 1 Pc For a windows pc we recommend MIDI OX It is a free and very useful app 1 Launch MIDI O...

Page 18: ...ip setup To toggle through the Fat Modes hold arp mode for 3 seconds Fat Mode is then displayed on screen and saved to EEprom F1 Mirror Mode Both Chips have the exact same data transmi ed F2 Octave Mo...

Page 19: ...ID type Carefully follow the instrucDons on the back of the trap door as follows 6581 PosiDon all jumpers on the LEFT pins 1 2 of the jumper sockets 6582 8550 PosiDon all jumpers on the RIGHT pins 2 3...

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