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I was missing the MDT BASS

comming this summer - CC / Pitch Bend in LiveSequencer

The folder structure is in the link i sent above. When it is freezing at boot, it probably is not an issue with the SD Folder. It should boot even without SD Card. I guess your boot issue is DAC related since the firmware expects the Teensy Audio Adaptor, not a 5102 by default. It can be...

This path is 5-6 years old. https://codeberg.org/dcoredump/MicroDexed/src/branch/master/addon/SD

We came to a very similar conclusion. Also switched to psram with a slightly modified sample-flashloader. This solved most of the known issues. Currently working on a sample/editor/slicer. SD-streaming would be wonderful but i lack the skill to get this working anything near the m8.

As much as i would like to do that i don't think i will be able to provide it and probably is an issue coming from other parts of the code. I was hoping it is kind of a known issue because of some changed code in variablePlayback. Please ignore my issue as long as it is not reported by others...

Sorry if i asked this previously @h4yn0nnym0u5e, i made a new attempt to use your modifications by dropping out temporarily other CPU and RAM hungry code to see how far i can get. I noticed that some short percussion samples end with a (full volume) click while others do not. This behaviour is...

just a blind guess, are you streaming the samples from the SD Card or from something else ?

live sequencer

got a real dx7 in the meantime, however blasphemously just using it as a MIDI input device :_)

Thanks so much for your quick reply. Hopefully i have some time next week to look deeper into it. It still surprises me that so few? users seem to have any interest in this topic, even it is the only way to produce pitched samples on the teensy - looks like the teensy is not that commonly used...

I see you made a lot of changes and improvements in this topic. Could you point me to the best/most recent version of your various branches to try to adapt for my scenario, meaning playing polyphonic, pitched samples from SerialFlash ? (or even SD Card)

i forgot, features like USB audio, WebSerial, WebMidi are usualy not available on a mobile phone browser. you have to use a modern desktop-pc web browser to use all of these.

you just open https://positionhigh.codeberg.page/ in your webbrowser, the teensy needs to be connected with the teensy internal, micro USB port to that pc. you can view what is supposed on the screen and can interact with the pc keyboard, mouse or a USB gamepad, connected to the teensy USB Host...

The teensy audio shield has unresolved digital noise issues in our configuration so It is strongly suggested to use the pcm chip from the bom. The main reason why this is better is that it doesn't need the clock signal, which eliminates the noise issue completely. Further the mute function is...

https://www.youtube.com/watch?v=8ODC6Ce51cA

https://www.youtube.com/watch?v=bRSscUWsitU

https://www.youtube.com/watch?v=KPLHbmFdCoQ

https://www.youtube.com/watch?v=yFXT1o5kOMk

I am trying to sync the output of the teensy with audio library and I2S Audio output to an external trigger (coming from MIDI Start command), from an external device. My finding is that the output delay at start is more or less random, which i assume is caused by the 3ms buffer of Audiostream...

I think going over 2x is too much to ask, anyway. I would be happy with a +-5 semitone pitchshift. About the code, yes i've seen that and think that is doable but i have trouble to revert from Nics file-access abstraction layer that he put in between in the newer versions.

I only use mono samples and i think this will never change. In the meantime i have reverted to an older version of the variable_playback before Nic introduced the additional file abstraction layer for serialflash and qspi-flash. These more recent changes had increased CPU and/or RAM usage and...

As a side topic - i think this is an issue with the audio library in general with wav files, when stopping samples, so they are not playing to the true end, there are always clicks or glitches. I tried to fix it with the provided envelopes and that kind of makes it fixable, but that also...

Yes, there is definitly a difference when putting in more yield(). If i disable all or most of the other sound generation beside the samples, i can get 3-4 samples playing nearly without glitches. I retried the PSRAM option but not seen any difference with or without it (maybe even a bit worse...

Yes, i need to work with git more regulary, i am still kind unfamilar with it and can use only the most basic functionality. So until getting to the next breakthrough we will concentrate on the code and our users prefer binaries anyway. Thanks again for all the tipps. I tested without any...

That are great news! I tried several times with much stripped out code of our project but all in all, so far no real difference. My feeling is that the SD Card loading is not getting enough/long enough cycles to get the data in. And so, the buffering to PSRAM can't really help. One question : I...

i did however not have so much sucess with the setBufferInPSRAM(true), i tried to call it before the ->playWav, after it and both but the results were equal or worse than without it. Maybe something in the main application needs to be done to make it work (better) than without ? The PSRAM "test"...

I can confirm this helped a lot in certain circumstances. Instead of crashing or very nasty audio artefacts, it is more solid now with less agressive audible issues. I will provide a audio demo shortly.

Very helpful tips, thank you. As one of the first steps i will try to strip out everything possible and observe if any step of it makes an difference. Since everything is interwoven, that might take a moment :_) will get back to you with what i find.

Hey h4yn0nnym0u5e, i am not sure how fast i can come with an demo code. I don't think it is that much helpful but hope to get you more involved somehow:_) first half of the video is Nics Library playing from flash. Second half is with your current code state for SD card. Dont't turn volume up to...

Hey, moo - very happy to hear some news from you after a while about your library. You know i am more on a novice level but when you would ask me, i would drop the littlefs and extra stuff for flash. The default serialflash library does not have all the extra fancy stuff like subdirectories...

That will be complicated but i understand your point. That was the reason why i tried to drag you in to see actualy the same issues we see :_) Since your help is priceless i wil try to find a method to show it otherwise but my fear is that is not really a problem in your code standalone but...

I understand you do not have much free time but just to let you know - you can test/experience our project with just a bare teensy 4.1 and your PC connected via the onboard MicroUSB and a Webbrowser. You even will hear audio over USB in the Webbrowser, see the "screen" and can control everything...

..much better - i now get 10seconds or more audio (with glitches etc.) but it is a big improvement!

Thank you for putting in time and work on this, h4yn0nnym0u5e. Currently i can't get your branch working for more than 0.5-1sec. but that very well might have reasons out of your scope and i will try to find it. One question: With the code from Nics repo, we had to insert __disable_irq()...

It is kind of off topic but since it is the same project, and there is some response going on, i try my luck. After the change of the voltage regulator and other changes ? during corona peak, we got reports that sd card access is only working after flashing the teensy and running our application...

Since in this thread it seems the puzzle pieces might come together i like to say Hi to you all ! @Nic, if you are reading here too, thank you again for your help and providing your great work making the only public "known" way how to play pitch shifted samples with the teensy. It is working...

https://www.youtube.com/watch?v=kJyyJFjBueQ

https://youtu.be/Ozouumx7OZ8 https://codeberg.org/positionhigh/MicroDexed-touch

https://www.youtube.com/watch?v=uECPTRHJcdo

https://youtu.be/jAyZdMGKCbk

MicroDexed was picked up for a competition at pcbway. If you like it, use it - please feel free to leave some (positive?) comment at: https://www.pcbway.com/project/shareproject/MicroDexed_Touch_current_version_with_PCM5102_d643a695.html