![]() On a scale of 1 to 10, how hard would it be to "make a circuit that converts CVs into the diode matrix that is read by the processor"? You almost make me feel confident enough to open the Pro One up, but right now I am still having way to much fun experimenting with the Touch System. Stike wrote:Again James, I bow before your deep knowledge. This will typically wipe the IC's legs enough to fix a lot of problems. Just gently pry up one end of the processor IC (no need to pull it out, just move it a little) and push it back in, and repeat for the other end. You might be able to fix your unit by just doing that. I have a couple of Mirage Samplers that I have to pop open every couple of years and re-set the processors in their sockets to wipe off the corrosion they get from sitting there a long time (dis-similar metal effect it is called). You will find a little notch in the metalwork for a ribbon cable plugged int it to exit the chassis. There is a empty IC socket in the upper corner of the PCB that will give you direct access to the D/A converter and a gate input that can be used to remote control the thing when the processor is removed. ![]() The processor does nothing except read the keyboard and those switches and feeds a D/A converter to play the voice. No way to make it record CVs unless you want to make a circuit that converts CVs into the diode matrix that is read by the processor.īTW the internal sequencer not working is either the connection from the keyboard or the record/play or the Seq1/off/seq2 select switches or the processor they connect to. It is not recording CVs at all, just key presses. The internal sequencer is the CPU and it is scanning the keyboard directly. Since I am not very handy with a soldering iron, I don't see this mod happening any time soon. If I could do a mod that would somehow allow the internal sequencer to record incoming CV, then I would be very,very happy. Polyroy wrote: Get the keyboard fixed and get some more mods done to it if you feel it's lacking certain things.Īt this point, I really don't miss the keyboard, except that the internal sequencer no longer works. frequency central, blue lantern, more i think) is modeled after the CEM3312. Haven't used the TH VCO yet so i don't know how loosely it resembles the pro1's oscillator, but it looks great and it's super cheap so who cares.Įlectricdruid's digital ADSR chip (used in a bunch of modules. something that differentiates it from the minimoog and other 'classic' saw-core synths. ![]() the pro1's oscillators are great tri-core oscillators that have amazing FM and of course insane hard sync. The new TH 555 VCO is a circuit based off of the pro1 oscillator. ![]() Gotharman built an entire pro-one clone a while back (you can check it out on his site). Unfortunately, as already mentioned, to get the same response/speed/everything else there is really no way around using expensive CEM chips (besides the 3328 the later chips are cheaper but mostly digitally controlled for polys like the ESQ-1). I have been looking at the possibility of making a Pro-One ADSR module lately, because even though i have a pro1 already, that thing pretty much destroys any other envelope i have used so far (only circuits in the same league have been envelator and wmd multimode). if the pro1 had come out a few years later i'm sure it would have used the 3328 anyway (seeing that it didn't utilize any multimode functions). The CEM3328 is only 20 bucks in that bundle (compared to CEM3320 which is $60-80) because it was the cheaper LPF-only version of the same chip when it came out and an Ensoniq Mirage off of craigslist has like 20 of them. You can get what is pretty much a clone of the filter if you build or have someone build this. while the oscillator, filter and the ADSR in particular are implemented perfectly - without a mod matrix it really wouldn't be a pro-one at all. IMO the the most important part of the pro-one is it's simple but super flexible modulation matrix.
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