audio to trigger

[Sean Costello]

Stewart Pye wrote:
> 
> Hi All,
> 
> I'm looking for a way to convert the audio outs of my TR 707 to short
> trigger pulses for triggering analog drum sounds. I thought about a
> differentiator but I'd get several pulses with that, or a 555 one shot but
> I guess I'd get the same problem. Any help would be greatly appreciated.

Before you do that, have you tried just triggering the drum sounds with
the audio outs of the 707?  Back in the analog days of yore (i.e. about
6 months ago, before I sold off most of my analog collection) I used to
sync up a 707 to my 606 and 202, and used the independent outs of the
707 to trigger the drum sounds on a Tama TS-305 drum brain.  It worked
like a charm.  The "Attack" control on the 305 allowed me to mix how
much of the original drum sound could be heard in the output (I think it
was a simple lowpass filter, designed to work with voltage triggers to
add more or less "click").  I used a Drumfire with the 707, and also got
good results.  Maybe some analog drums need a conditioned pulse, but I
have the feeling a lot of them will work with any good percussive
sound.  Twin-T filters and the like should be able to trigger from the
707, with the 707 sounds providing some nice attack coloration.

Sean Costello