Hi!
One question about MF-101: is there any way to control envelope contour? A I do not need those waw envelope with raised attack… I need a 0 attack, 20-50 decay and that’s all. Any suggestions here?
You could use the envelope out to trigger the gate on another envelope generator and send it’s CV out to the filter CV in. But you would need an envelope generator from another synth, module, ect. Or since you want no attack time, trigger a single shot ramp down LFO.
Not directly. Tracking input amplitude you can certainly drive a signal in that has this characteristic and adjust the Envelope AMOUNT pot accordingly but the audio signal is likely different from what you would send in to be ‘followed’. There is a modification for the MF-101 that splits the two but requires some rewiring internally.
The other option is the drive CUTOFF CV with an external LFO, seems you want a ramp but not sure if you want this to fire in repeating fashion, or a one shot deal for each time the incoming audio goes beyond a certain threshold (ie. slightly louder than no sound at all).
This leads me back to the Synthesizer.com instrument interface which can in turn trigger an ADSR envelope module (each costs about $92, but you’ll just need a power supply and a DIY way to rack it which can be simple as a 3/4" wood box).
Another, higher cost (double) option is the MP-201 multipedal and you can setup an HADSR (ignoring the Hold/delay, Sustain, Release) portions and bind the EG trigger to midi note received on a given channel. Then just route your audio out of your midi device (assumed) through the MF-101 and the channel form the MP to the Cutoff.
If you have a guitar or bass, you’re back to a pure CV option such as the Instrument interface, ADSR Synth.com modules referenced above.
The challenging part is the trigger/gate portion. If you need the LFO (continuous cycling) type of env, then a low budget way that was recently documented here using Ableton is an Audio loop with amplitude characteristics to drive the CV of Cutoff.
Hope this helps.
Thank you guys! That really helped but one thing drives me mad - why didn’t MoogMusic make a several envelope contours choice? Quitre strange to have only those waw envelope… Far better is the classic ramp… Strange-strange-straangeee )
The 101 has an envelope follower, so the filter cutoff follows the amplitude contour of the input signal. An envelope generator is a different ciruit. Some filters with envelope follwers will follow in reverse so the filter cutoff drops as amplitude raises and rises as the amplitude falls. This can be accomplished by sending the envelope out to an inverter on the CP-251 and back to the cutoff CV in. Other filters on the market are static, ramp up/down, or have an onboard LFO to modulate the cutoff.
The murf is a bank of filters with it’s own attack/decay envelope generator.