Audio to control voltage patch type patch

[James Johnson]

I'm looking for a patch that if I remeber correctly a long long time ago someone made that will convert audio in into a control voltage for sync? does this sound familiar to anyone?

James

[Kassen]

I don´t know what patch you mean (there are bound to be many) but it´s not that hard.

You get your audio in, then filter it with a simple bandpass to emphasise the frequency or sound you want to sync to. then you use a envelope follower on that and put a compare to concstant module over the control signal. fiddle around with the attack and decay of the follower and the "treshold" value of that compare module. Set them so you get the tightest possible sync without "false starts", the exact settings will depend on your type of source material. That should get you a logic pule you can sync whatever you want to. Obviously rimshots will work well, strings and pads less so.

If you have a simple drum loop you might be able to get multiple sync signals by using multiple bandpass filters. You might for example like to get one pulse for eack bass drum and onother signal on each snare.

More eleborate constructions, for example using a side-chained compressor or even a expander might be needed if you are dealing with particularly complex input signals, for example distorted guitar. If at all possible try and get a clean, well defined input signal for a tight sync.