Zounds, thanks to MrRoland! (Excellent point, absolutely check power settings). Maybe there's a system audio element you can turn off. Firehose of ideas follows.
Since nobody else has chimed in to say they have this issue, it may be fairly safe to rule out a bug in 6.3
In my Win OS, the main audio mixer detects onboard and external audio when plugged in there can be occasional drama when something 'sticks' for some reason or other. My ASIO4All driver interface is handy (quick, light, instant) displays both as active.. I can turn on/off either one in its interface - and the Windows mixer might also have things left behind which can be zapped or muted by deselecting it in the OS mixer.
I also would make sure to turn off things like Mic and Cam and any voice input or communications functions. Maybe some settings relating to "accessibility" could be active (like "listen for voice commands" type things - which may be interfering).
I haven't dealt with some old settings for decades, but some old device issues I remember made for some weird problems - like moving the mouse causing audio glitching - a change to old school startup and other .bat files and bouncing the drivers around limited IRQ? slots - glad to forget this - not to say it's all less complex today - maybe often more user friendly on the face of it but equally Kafkaesque at times.
Your last comment sandalholme, these points make a good case for something system side, rather than pedals etc.
Something like "Use hardware" or "Always Resample 41.1kHz<->48kHz", "Pull Mode", "Latency compensate", "Force Driver to 16 Bit" - mostly things we might not see or deal with ever but if things like this exist in your audio driver settings, maybe something on or off, up or down here could work.
I'm wondering if you've also checked the other 2 curves, "Note Off" and "Aftertouch" - esp. if it now looks like key presses also set off the strange noise.
All things in perspective, it does seem like maybe something to do with your system's DAC (digital audio conversion) is worth considering. If something is struggling there, it could mean that packets are being translated from one sample rate to another in chunks, leading to glitches like loop point clicks. (TV to stereo system has this prob currently, little click per second or so, noticed when bass is heavy) - the output signal might contain extraneous data (like surround data) which the stereo system drops and resamples on the fly with a quick and dirty output - probably fixable but it's only noticed in some Movies and broadcasts, otherwise I can live with it. Exactly what decoding problem it is, will remain a mystery but maybe something like this is your gremlin.
I didn't ask, because originally thinking about physical pedals but maybe if none of these things help, you might want to list some specs (like machine, keyboard, what sound drivers, using any external audio device or what onboard sound drivers you use and other such things, powered speakers, headphone amp or just system headphone jack etc).
Since I'm not OSX savvy, there would be others more likely to find (or know about) specific things to do with your OS.
Speaking of hardware, maybe it's possible that your keyboard is sending weird note data? Maybe it only happens with specific notes?
Sorry we can't be there in real time to see all the variables.
If you're using onboard sound or an external audio unit, maybe drivers for these can be updated but my experience is that this is often very typical given customer support advice which while good advice, might be glossing over something else and I rarely find this to be the answer.
Suggesting some other things to consider within Pianoteq, in case they help:
Edit/Preferences/Devices tab:
- check that the correct audio device is active (sometimes using another audio app when not plugged into my external sound gear can require some manual re-set at both ends of a session). Maybe updated drivers are available, or a roll-back?
- increase the "Audio buffer size" (higher latency but more stable).
- "Sample rate" lower - or matching any outboard gear or DAW settings - 41KHz or 48KHz is truly OK unless some particular preference/reasons apply for higher specs. If you sample rate is too high, it may be that the DAC issue resides here.
Edit/Preferences/Perf tab:
- match your Internal sample rate to the same as Host sample rate - or try other numbers in the drop down menu there. Maybe a mismatch or certain number combos here may create some strange DAC artefacts like you describe. (this feels a good chance)
- check polyphony. Choosing lower numbers might really not be noticeable.
- check box Multicore rendering if applicable.
Other things coming to mind, sometimes, you might find some setting for CPU which is a little more specific than "High power" vs. "Balanced" type check-boxes in settings. I haven't a clue about OSX, but there might be some power users who improve things with a few command lines - with all caveats inferred here.
Odd chance that you have an old version of Pianoteq installed, are they set the same? I think they should be independent and not interfere with each other but may depend on other things - like, if one was installed for all, or just current user.
One example of other system settings, maybe there's a choice to favour system processes above program processes - I've found favouring programs is better for my machine even though others report the opposite. Only one of my DAWs seems to run better when favouring system processes - maybe it's hard-coded to be 'nicer' than other DAWs (haven't checked why but goes to show that no single thing is standard for all).
Probably exhausted things I'd suggest for now - but hoping something here works out for you sandalholme - it's always good to finally eradicate the things which take us away from the experience!
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors