MUSE tuning issue

[Kwamensah]

So I just got my replacement Muse, and while my hardware issues are now resolved (VCA bleed, USB midi not working, weird clicking and popping while swapping voices) the very annoying tuning issue still persists. Sometimes it will drift out of tune within minutes. Quick tune resolves the problem but if there is any kind of temperature change at all (ie, turn off the synth and turn it back on) it's out of tune again. I'm starting to think this is a software bug because it wasn't anywhere near this bad on 1.10. I updated to 1.20 and bam huge tuning problems.

[Guest]

Hi Moog and All, I have tuning issues. Read somewhere unconnecting everything during power on may help. It doe but only sometime. I warm up and quick tune too. Besides inconvenience sometime it simply does not work time after time. Is there a better remedy? Is this something that can be fixed at software level or I return Muse to store?

[Guest]

Hi Moog and All, I have tuning issues. Read somewhere unconnecting everything during power on may help. It doe but only sometime. I warm up and quick tune too. Besides inconvenience sometime it simply does not work time after time. Is there a better remedy? Is this something that can be fixed at software level or I return Muse to store?

Try doing a full tune from a cold start. Like leave it off overnight and then in the morning go straight to the tuning menu and do a regular tune (not quick tune)

And see if that helps. Also I've noticed the tuning gets more stable over time as the oscs break in. Maybe I'm imagining it but it seems like after some oscillator exercise it got more stable. Perhaps it needs to spend a certain amount of time at it's nominal temperature for values to stabilize on new components. Could be completely false but that's my theory.

[steve_moog]

Also I've noticed the tuning gets more stable over time as the oscs break in. Maybe I'm imagining it but it seems like after some oscillator exercise it got more stable. Perhaps it needs to spend a certain amount of time at it's nominal temperature for values to stabilize on new components. Could be completely false but that's my theory.

This is a guess but I believe each time you do a quick tune it saves the various offsets for whatever the current voice board temp is into a lookup table, which it then uses in real time to compensate for varying temperature. So, as you perform more quick tunes it saves more data points and so tracks better with temperature changes without user intervention.

[Kwamensah]

Also I've noticed the tuning gets more stable over time as the oscs break in. Maybe I'm imagining it but it seems like after some oscillator exercise it got more stable. Perhaps it needs to spend a certain amount of time at it's nominal temperature for values to stabilize on new components. Could be completely false but that's my theory.

This is a guess but I believe each time you do a quick tune it saves the various offsets for whatever the current voice board temp is into a lookup table, which it then uses in real time to compensate for varying temperature. So, as you perform more quick tunes it saves more data points and so tracks better with temperature changes without user intervention.

To clarify, what I did was run a midi file of toccata and fugue into the synth, ran it for a few hours, and this stabilized the tuning. This was after doing a full tune (not a quick tune) that morning from it being cold overnight. The reason for this was I was tweaking my patch to try and get as close to a pipe organ as possible and then record the results but what I noticed was the tuning got better over time, and it stayed better. Even after a cold start.

So my supposition is that thermal expansion occurs on the components which deviates the values, and at a certain point no more expansion occurs as the components are "broken in" and then the tuning becomes more stable. Some evidence I noticed of this was some voices that were not as accessed in the round robin when I was playing other things were wildly out of tune but the more common ones were not. This midi file worked EVERY voice so maybe this helped with stability and consistency of tuning between voices.

Or it could be as you say and the software is adapting. But being that it can't really even run the delay without glitching, and the cpu can't really handle a lot of mod destinations without crashing I doubt it.

Also I kinda thing Quick Tune is worthless because it tunes for like 30 minutes and then drifts again.

[steve_moog]

Also I kinda thing Quick Tune is worthless because it tunes for like 30 minutes and then drifts again.

Wait, your quick tune takes a half hour!? Either your unit is behaving strangely or mine is, I have never had a quick tune take more than a few moments. In fact I just did one, it took less than a second. How long are other people’s quick tunes taking?

[Kwamensah]

Also I kinda thing Quick Tune is worthless because it tunes for like 30 minutes and then drifts again.

Wait, your quick tune takes a half hour!? Either your unit is behaving strangely or mine is, I have never had a quick tune take more than a few moments. In fact I just did one, it took less than a second. How long are other people’s quick tunes taking?

No, I mean you do the quick tune and the effects of the quick tune only last 30ish minutes before it starts drifting. Only the full tuning has been useful in my experience.

[steve_moog]

Also I kinda thing Quick Tune is worthless because it tunes for like 30 minutes and then drifts again.

Wait, your quick tune takes a half hour!? Either your unit is behaving strangely or mine is, I have never had a quick tune take more than a few moments. In fact I just did one, it took less than a second. How long are other people’s quick tunes taking?

No, I mean you do the quick tune and the effects of the quick tune only last 30ish minutes before it starts drifting. Only the full tuning has been useful in my experience.

Ah ok - that makes sense. it'll be interesting to see what you find if you end up doing the 1.1 v 1.2 tuning test.