If I say “gated LFO” would anyone understand what I’m looking for?
I’d like a design / schematic of an LFO who’s function can be started once a gate is applied. I’d like to be able to control the starting point in the waveform with a CV.
Any ideas?
Doug
I am not really sure if you would really like to gate the LFP (switching it on/off) or if you rather would like to control the start phase?
Gating for on/off can be done by using a VCA that is able to handle low frequent to DC voltages.
The LFO sync (as Oscillator sync, not like midi clock sync) of the Voyager does so. It is easy to restart the LFO shape at the zero point when a note on happens.
I’d like to start the LFO using a gate and be able to control the start phase. Does that make sense?
Starting via VCA and simple gat is no problem. But adjusting the start phase variable might be a problem to do in the analog domain.
But free run and staring it from a certain point should be doable easy.
I do not know of a single analog synth with a variable start phase. All digital Waldorf synths do this. But in digital it appears to be easier to me.
Doug,
What you’re referring to seems to go beyond simple reset sync. Ron Rivera (of the former RMS) did something like this with the sync function. Normal reset sync forces the same period between two waves, but chopped the synced wave.
Rons PMS function allowed reset sync, but the initial phase difference between the two input signals could be offset (manually, or by a CV) by a range between 0 thru 360 degrees.
Voltage-controllable phase offsets like this could also be applied to lfo’s.
The only synth modules that I know of that had this PMS (phase-modulated sync) function was the Aries modulars (iirc AR-338 vco).
Regards,
Lawrence
The Voyager LFO does this. You can sync it to the KB, ENV, MIDI or let it run.
I think its worthy to note that while the Voyagers LFO can be triggered with a gate, being analog it won’t have a tempo sync.
Isn’t this fair to say?
Eric
Yeah, it isn’t tap tempo. But I didn’t think that was what he was asking for. He was just wanting the LFO to start on a gate and not free run. (If I understood his question.)