[sdiy] Roland TR mods

[gregory zifcak]

actually, there are quite a few straightforward mods you can do to the 707 
and possibly the others too. the 707 uses analog egs and vcas for the hh and 
cymbals, so you can add decay controls and audio inputs (sequenceable 
gates). the panning is also all done in the analog domain so you can change 
resistor values or replace them with panpots. if you want to get really 
serious, you can add new clock oscillators to the clock inputs of the 
samples, so you can have independent pitch control over each sound. i used 
555 oscillators.

in addition to groups.yahoo.com/group/tr-707 i have some example mp3s and 
details at userwww.sfsu.edu/~gzifcak/gear_mods.html

that said, bending them gives some good sounds too!

good luck,
greg


>With the 707 626 and 505 type boxes you are talking about circuit
>bending here and not mods technically. I've modded a tr505 with 24
>banana jacks in a break out box and it is very cool.
>Most of the mods came from the larger ic that I think hold all the
>samples etc.....the 707 and 626 are very much the same in that they have
>one or two large ic's that are full of good bend points.


On Thu, 29 Sep 2005, Bart Provoost wrote:

>>Hi,
>>Does anyone have some documentation about drum machine mods? I have
>>some TR-626's, a TR-707 and a TR-727 and would like to mod some of
>>them. Some information about interesting connections etc. would be
>>very welcome, I don't want to miss great sounds or damage the
>>instrument :) I also have a TR-606 but I already added the Analogue
>>Solutions kit for separate outs and the sound mods (very
>>disappointing, it seems like only the "original" settings are usefull
>>sounds, other settings just give very weak sounds). If there's
>>something else to do with the TR-606 then I'm also interested.
>>Thanks!
>>Bart
>>--
>>http://filters.muziq.beq.be

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