[sdiy] tr 707 question

[Stewart Pye]

Damien,
Do you have the service manual?

The rimshot trig out actually comes from a separate pin on the micro, 
however there is a separate trigger signal for each voice that goes to 
the envelope generators. They are standard analogue decay EG's so you 
should get a trigger pulse right at the beginning of each sound. I think 
it will be a negative going pulse. I'd replicate the EG circuit but 
without the decay cap so that the Accent level varies the trigger level 
and you get a positive going pulse.

The copy of the manual I have is a bit blurry, but you should be able to 
take the signal from the outputs of IC27 and IC28.

I guess I should go open up my 707!
If you really want to hack the 707 you could put a decay pot in for each 
voice and take the outputs from the envelope generators!

Cheers,
Stew.


cheater cheater wrote:
> Hi guys,
> is it possible to get analog gate or trigger out of the 707 for the
> separate sounds? I don't mean through midi, the timing isn't good
> enough that way. I think it could be possible to intercept the
> communication to the memory, to find out when the 707 is reading off
> the beginning of the samples.. right?
>
> Cheers,
> D.
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