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That definitely sounds like input phase inversion to me. Try swapping the opamps between the sources: use the bend one for modulation, and vice versa. Does the symptom follow the modulation source, or the opamp channel? Rather than try to hash through divider theory, I'll just point you at a reasona...

Congratulations, you have discovered JFET input related phase inversion. From: http://www.analog.com/library/analogDialogue/Anniversary/6.html Q. What other features of op amps should the user know about? A. A common problem encountered with JFET op-amps is phase inversion. If the input common-mode ...

Without knowing exactly where it sits in the circuit, my guess is that you want them both to be the same...either both inverting, or both non-inverting. Think about it this way: you invert it once, it's upside down. Invert it again, and it's right side up again. Or else, never invert it, and you're ...

A couple ideas: 1> Do you have any sort of connection from the opamp outputs back to the -inputs? You'll notice in crashsick's pics that the non-inverting one just ties the output right back to the output, and the inverting one has a 1K resistor. I don't see these connections in your pic. They're es...

So what's the filter topology? How many poles?

And where are the shots of the guts? I wanna know of there's a PIC in there

What about the Analog Devices SSM2142 Balanced Line Driver IC? Anybody familiar with gear that uses it? Anyone have any personal experience with it? For electronic balancing, it's fine. Affordable, well behaved and neutral sounding. The new THAT chips have some clever twists on the technology that ...

You say you found 0V, +12V and +24V...it sounds like you've assumed the wrong reference for ground, and actually found a -12V/0/+12V supply arrangement. 0/+12/+24 is a fairly unlikely arrangement for a synth. Just because it's tied to the negative lead of a 'lytic cap, doesn't mean that it's ground....

You say strap the positive to the positive V output... would this be the audio (15V) supply lines or the logic/switching (24V) lines? I'll peek in the manual to see if I can make sure, but I'm just trying to wrap my head around it. The 15V and 50V supplies are regulated and the 24V supply is unregu...

The sense lines will need to be connected somewhere. They're used as feedback back into the supply...it's checking on the voltage present somewhere in the circuit, to verify that it's correct, and adjust if it's not. For some applications of supplies like that (consider an automated printing press: ...

If you don't have a way to verify that you're approaching the limits of the supply, it can be hard to know how much current is enough. If you're handy with an Ammeter, set up a mix with lots of IO and take measurements of each rail. You can verify how much current is being used on each rail, add a f...

I seem to recall a tape delay that used a rotary head mechanism, so the tape heads could move slower or faster than the tape. I'm googling, but can't find any good links. That's effectively granular, isn't it? Each head would represent a grain, with the grain shape controlled by how the head physica...

I would suggest that an autoranging ohm-meter is called for. It makes sorting out resistor values a lot easier.

Then stick them in the foam-core!

Have you tried a full-range speaker, like an Auratone or those new Avantones? Maybe part of what's bugging you is the crossover on a two way speaker. The crossover will introduce some inaccuracy in the midrange. If you're sitting really close to them, then could also be a funny spatial location effe...

I've got one and really dig it. To my ears, for my kick sound, it beats the D112, and holds it's own against the Beta52 and e602(or whatever model that kick mic is). Not too much click, and plenty of boom. The LF boost setting gives it the sound I often went for with EQ, so I don't need to be as dra...

It's not a guaranteed sign that something's wrong with the heads. Do you align the machine regularly? It could be that it needs electronic calibration. It could also be a sign that the tape path needs adjustment: a head, guide or roller is out of position. If it twisted the tape such that it created...