The wav file you uploaded has a transient spike on the left channel only that occurs twice. I doubt this is software. An xrun would appear as a hole (silence) in the audio. This is a very short but full volume spike. It lasts about 10 samples but most of that is ringing. The spike itself is one sample. So this looks like a very short splat. It could be a dodgy capacitor on the soundcard. I think this is electrical.
(These three screenshots are of the same spike at different zoom, the last showing individual samples at 44100 samples per second.)
The audio level is low with peak program about -30dBfs. If you play audio through the soundcard from another OS at a similar level you may observe the same effect, i.e. the spike it more prominent because of the low level audio but it is definitely a fault and as I say, quite likely to be an electrical issue. How did you record this audio? Was it via a cable to a recorder? Via a desk? etc.
First of all… thank you…
I recorded the sound with MixBus from the audio output of the Zynthian… then the audio output that enters the Focusrite card that I use to record… But the noise can also be heard with the Zynthian disconnected from everything (audio and MIDI) and with just the headphones plugged into the Zynthian sound card… Do you think I could try the raspberry audio? Even if it’s not faithful… just to see if the defect comes from the card…
This time the two peaks were on a single channel… yesterday they were ping ponging from one channel to another…
You could certainly try configuring to use onboard sound and see if the problem persists. Is it only Pianoteq that is affected or do other engines exhibit this issue? Do you have VNC enabled? (Try with VNC disabled.) Does the Pianoteq native GUI (seen in VNC) performance graph show issues (indicated by red lines IIRC)?
No, VNC is not enabled. Now I try to configure the internal audio and see if it still does. Otherwise I’ll change the sound card…
It does this with all sounds, not just Pianoteq…
Riban, since you like a challenge… le51 tried to help me but I couldn’t get the touchscreen of my Waveshare 4A display to work… I’m missing some files which le51 patiently pointed out to me.
All this on the post: Waveshare '4A only GPIO touchscreen - #6 by le51
I have to say the sound card manufacturer was GREAT. He refunded me for the card that was making noise and the new card arrived this morning … Unfortunately, however, the defect is still there … less, but it is. This is strange because the sound card was mounted from the beginning and it didn’t have this problem… I’m starting to think it’s the GPIO of the display… could it be that they have a common pin that creates this defect? It does this with both the Waveshare 4A display and the Adafruit 3.5…
I’m designing the support structure for the 6 switches that will take the place of the 6 potentiometers. I found the 6 “chicken head” knobs and will try to follow DR Riban’s instructions…
Dear Riban, the commutators with the 2 Kohm resistors… Work perfectly!!!
Many many many thanks.
I ask for yet another help from Riban or anyone who knows these switches. I put 5 switches to 6 positions and for these no problem. But on oscillator 3 you need a 7-position switch… so I took a switch that has 12 pins and is adjustable. Unfortunately I don’t understand how to connect the pins as there are 3 pins that divide the 12 into 3 groups of 4. Thanks for any info
Can you push/pull the button ??
Type the name of your rotary switch with “datasheet” in Google and you will find the internal wiring. It’s hard to tell from a picture and without a multimeter.
If it was me, I will test the A1 to A12 with the multimeter and voila
Ps: some rotary switch have and endstop to prevent going after the 7 of you don’t use the full 12 capacity.
That looks like a 3 pole 4 position switch. You want a 1 pole 12 position switch with adjustable end stop. It would have 12 pins around the edge and a single pin in the middle. It is plausible that your 3 pole switch child be used similarly but you need to use a continuity tester to check which pins make. A continuity tester is often a function of a multimeter but can be made from a battery, lamp and wires
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