I thought the tuning was handled the same between x0x and 303?
The circuit diagrams certainly look nigh on identical as far as I can tell anyway.
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You say you moved all the pots.. I take it you mean the internal trim pots? Most of them should ideally be left alone unless you know what they do and have the means to test them.
TM4 is the main tuning trim pot, and largely does the same as the main tune pot. So it is not too critical where you leave that, as tuning is easily corrected via the main panel tune knob anyway.
TM5 is the tuning width. So for example when you play a low C, then a high C, you need it to be a perfect C at each end, and not a low B# & a high D or whatever. This is probably why I thought your demo sounded a bit out of tune?
This is the awkward one to set correctly, if you are not used to doing it. I think the manual suggests using a scope to do this. I just used a good software instrument tuner which worked great.
TM6 is also an important one (but easy to set). This sets the voltage for much of the analogue audio section (5.33v). If this is off, then it also messes with the tuning. And can also supposedly affect the tone of the machine. Plus of course if it is too high, then this is not good for the health of many components. That said, this trim pot shouldn't have much range on it. It is less than a volt difference from min to max, if I remember rightly.
There is also TM3. This one confuses many people (including me!
) This sets the filter/resonance centre frequency(?). Many people just set this according to whatever sounds good to them. Which worked well enough for me too, and also compared well with the ABL software clone I have.
However, as I mentioned before, when you build your x0xb0x, you'll learn how to set all this up anyway. And it is just as applicable to your 303. Particularly as nigh on all the parts are labelled the same between the 2 machines. IE, TM5 is the same on a 303 as it is on a x0xb0x.