[sdiy] tr 707 question

[Eric Wood]

It already is a nice little machine! If you really look into this thing you will realize why, really one of the vintage greats. I also have a 909 and still think the 707 is at the top of my short list.


Sent from my iPhone

On Aug 28, 2010, at 8:48 PM, Stewart Pye <stewpye at optusnet.com.au> wrote:

> 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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>>>> 
>>>> 
>>>>      
>>>    
>> 
>>  
> 
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