At short rates the filters drops lower then on long rates. That fixed the issue but now the ‘rate’ control also has an influence on the filter range. To counter that I used an opamp (non-inverting) to amplify the control voltage going to A10,A11,A12 over the 3.3k resistors and coming from A13. The filter consists of 3 identical stages, changing capacitors c25, c26, c27 from 33nF to 68nF shifted down the range, however, not only the bottom end, also the top end. IMHO it really needed to go down a lot deeper, especially if you want to use it with synths. Sending white noise through it I found out it’s range was about 700Hz-18KHz. I did like the quirky filter but it just hadn’t enough ‘Oomph’ to it. I found the filter a bit lacking in range when used for synths. This one is a bit more invasive to the machine, so it might not be for everyone. Just install a switch between this and the filter output and you’re good to go. As you can see in the pic, output 6 from A11 provides a band pass output. I don’t know whether it’s useful for a bass guitar, but it sure is for running synths through the thing. This is a really simple mod to perform and opens up a whole new range of sounds. The filter really can get some 303-like action going on, especially when you use the square wave generator. It should give an idea what the unit is capable of when applied to synths. I recorded some tweaking and went through more or less all the settings except the external inputs and triggers. It starts with a clean version of a saw wave riff generated with a Korg Gadget app. I’ll try to address the implementation of some mods in this article. You’ll can find the schematics of the EHX Bass Micro Synth easily enough on the web, but for the lazy, click here. Things could do with a bit of tweaking here or there, but that’s up to personal taste. But I’m pretty happy with the results so far. Replaced the internal power supply with an external adapter (I really didn’t trust that thing).Added trigger/filterCV leds (the thing could use more leds). So, here’s a brief list of things I ended up doing to it: So I decided to transplant the pedal’s guts into a 19″ rack casing from an old and broken M-Audio firewire audio interface and at the same time see how I could make it more synth/modular friendly. Sourcing 10 100K linear sliders with the right dimensions turned out to be rather difficult and costly. After bringing it back to life I noticed all the sliders were far from performing well and should be replaced. My ‘broken’ EHX Bass Micro Synth was gathering a ton of dust.
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