Mods on the Sp-404 SX / Hacking the SP-404 SX

[koenigdruckwell]

Hi there,
I'm a bit new to this Forum. I just wanted to share some interesting things:
i'm currently developing some super cool mods for the SP-404 SX and the SP-404. These are basically hardware Hacks:

One is the processor-/pitch Mod that allows to change the processor speed and thereby the pitch / sample rate of the machine.
Here is a video that shows how it works/sounds:

_DSC0007 - Kopie.JPG (62.88 KiB) Viewed 3544 times

https://www.youtube.com/watch?v=Saez9hHo5Wo

A second one is the CV-Mod - it's adding 3 minijack inputs, that allow to manipulate the "Ctrl-knobs 1, 2, 3" via controlvoltage from a modular synth (0-5V)
I'll upload a video to show this mod soon!

_DSC0043 - Kopie.JPG (99.49 KiB) Viewed 3544 times

I'm also working on detailed build documentations/tutorials.

Please feel free to comment if you have done similar modifications, or if you have any ideas for mods.
Maybe now that a lot of users switch to the newer MK a lot of older SPs could get this threatment to improve their sonic capabilities massively.
Cheers!

[NearTao]

Cool idea. Have you written up anything around how to do the mods. What kinds of resistors, crystal diodes, or whatever you've used to make this work?