In fact it is not
What might put you on the wrong way in this video is that you hear the cam mic hence the sound of the sicks hitting the plastic head get also caught... there is also a blurry note on the original manual that might suggest this... but under the hood...
I am currently working on an accurate VST hybrid of both of the modules that you can see in this video... (Simmons SDSV(5) and SDS7)
I usually go down to schematic stage and here is the guts of the SDSV system:
You can see that the main triangle OSC (blue line) is mixed with the noise generator (purple line) and from then a part of this mix (green line) set by the click amount pot is fed to a first VCA (VCA1), the click itself get generated by a short boost of the noise source, it generate the short attack click part.
Once the initial boost is done the final sound is shaped by VCA 2...
The voice cards were set slightly differently, depending on the sound the trigger velocity will affect different part of the circuit...
Last but not least the additional card for HIHAT and CYMBALS were both EPROM + Noise Generator based.
The clever trick ( similar to the linn LM1) was to loop constantly the EPROM sample (which is a short 8bit linear 4k cymbal sample stored on a 2732 EPROM) and the trigger will only launch the VCF and VCA... contrary to the Linn the sample is read forward then backward.
As bend also influence the EPROM reading sample rate you can get the nice low bit effect you can clearly hear in the video above
Also notice how the sound seems to bend up when he release the stick...
This happen because the EPROM sample rate cannot goes under 0... so it goes down down down and at some point might stop or voltage get rectified hence it goes up
Hope that helps!
Last edited by Aly James on Wed Jun 11, 2014 8:03 pm, edited 1 time in total.