[sdiy] tr 707 question

[Stewart Pye]

It doesn't have VCA's for most of the voices. The envelope signals are 
multiplexed and fed to the REF input of the DAC, as can been seen in the 
service manual...

Looking at the service manual I'm glad I didn't sell my machine. I think 
I'll add trigger outputs to it....

Regards,
Stewart.

cheater cheater wrote:
> ohh that's pretty cool, i didn't even realize this thing had analogue
> envelopes/VCAs :) Yes, A/R pots could definitely make it interesting!
> Also a second L/A/R envelope for the pitch - you can use VCOs for the
> clock and then it's starting to be a nice little machine..
>
> Add a little bit more special knobs (HPF for the cym and HH, LPF for
> the BD, overdrive for the BD, overdrive for the cowbell/rimshot, said
> pitch envelope for the BD, lfo for the HH, additional VCO output -
> from the clocking VCO - going into the BD channel through its VCA,
> semitone selectors, hardsync between instruments) and you've got a
> very cool little thing.
>
> D.
>
> On Sat, Aug 28, 2010 at 23:13, Stewart Pye <stewpye at optusnet.com.au> wrote:
>   
>> 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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>>>       
>>     
>
>