Hello fellow Elektronauts,
I just started a thread on Reddit (https://www.reddit.com/r/synthdiy/comments/urkik9/elka_wilgamat_turning_an_organ_accompanion_into_a/) regarding this Mod, but maybe someone on here is interested to chime in and share their knowledge with us
A friend and I got hold of a super cheap Elka Wilgamat, a 70s Rhythm and Melody Accompanion with some nice and crispy drums, a pleasant bass and suuuper cheesy melodies.
After having it tested properly we decided to give it a shot to search for Individual Outs of the Drum Elements and by Chance also found the Trigger In of the Bassdrum, which led to the Idea of having all drum parts and maybe even the other elements aswell to be triggered externally and picked-up individually.
Whereas we were lucky with the Bassdrum the other parts (at least the Snare Drum and High-hats) seem to be a bit harder to grasp.
For the BD trig, we simply added a Jack that is connected to R7 and GND on DM1 (see picture 1). For the Individual Out we found resistor R8 to be the one we need to aim for. (Both traceable on picture 2 see orange highlights)
After we were successful with hunting down Trig and Indiv. Out of the BD, we went on to what seemed to be the SnareDrum (SD), hooked up a Jack for the trig to R6 and GND (on DM1 - Picture 1/2) in the hope to trigger a snare drum which is picked up by an Indiv. Out connected what seems to be R52. Here the first problem emerged.
If one compares Pic. 1 and 2 you will find that within the circuitry of the SnareDrum on Pic 2 there is a Resistor labeled R52. However this one is not to be found on Pic.1 but rather 2x R50. Therefore we went on, tried our luck and connected the Indiv. Out Jack onto the lower end of the vertical R50 (Pic1). Triggering went just fine, here it seems we found the right connection. However on the Output side, it seemed as we were only picking up the Trig. Signal as it did not sound like a Snare but rather like an Impulse.
Taking a closer Look onto the schematic on Pic 2 one can see that R6 is connected to a further PCB and thus we were wondering if the problem is buried here. Maybe someone on here has some suggestions on how to approach this?
Furthermore, as all the rhythms contain at least one or two HiHats - which are not to be found upon DM1 we were wondering if these might be triggered by R4 and R5 on DM2 - but if so, where could their Outputs be?
I’d be happy about any feedback if someone is interested to chime in and share their knowledge with us