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I see up on the left. Got it. Thanks again.

Thank you again for your additional hints. I am not sure what you mean by "it's really helpful to post code in the </> code tags"

Thanks a lot for your help. I just saw your reply after I figured it out. Thanks again.

Fixed it. Should be AUDIO_MEMORY_EXTMEM not AUDIO_MEMORY_PSRAM64

I should add that I have run the ext memory test and it executes without errors. (https://github.com/PaulStoffregen/teensy41_psram_memtest/blob/master/teensy41_psram_memtest.ino)

Thanks for your reply and I am using your effect_delay_ext.cpp ,effect_delay_ext.h, extmem.cpp and extmem.h and my code compiles but no sound out of the delayed channel. Please see below code. It works if I use it as is but if I uncomment AudioEffectDelayExternal and comment out AudioEffectDelay...

Have effect_delay_ext.cpp and effect_delay_ext.h been modified for use with 2 PSRAM chips soldered on the Teensy 4.1 board ? Will the Audio Design Tool AUDIO_MEMORY_xxxxx be updated to use those chips as well ?

Thanks again for your willingness to help. I'll subscribe as you suggested.

I got delayExt to work correctly by erasing everything in the C:\Users\****\AppData\Local\Arduino15 folder. Reinstalling Arduino IDE 2.1.0 then NOT installing Teensy 1.58.1 but rather 1.56.1. Newer versions didn't work and older versions had installation errors. Works well now.

Thanks again for your willingness to help. Sorry for the confusion regarding the PT8211. I have a board I designed and JLCPCB made for me a couple of years ago that has a PT8211 and a 23LC1024 but I also tried the AudioControlSGTL5000 board with a PT8211 soldered on. Neither worked when the...

Thanks for your willingness to help me out. The board is a pt8211_1 with one 23LC1024. I have tried with a 3.2 and a 3.6 both will work with my code and the audio package Paul has at github as long as there are no delayExt calls. I went to your github site and downloaded...

Spoke too soon. Worked once then all subsequent uploads locked the Arduino IDE. Had to use task manager to close the IDE.

Thank you SO much ! I have spent days on this. Talk about head scratching. Anyway again thank you.

AudioEffectDelayExternal was working fine for years then I updated Arduino IDE to 2.1.0 and Teensyduino 1.58.1 now any inclusion of it prevents the sketch from doing anything including Serial.print. If I replace the AudioEffectDelayExternal with AudioEffectDelay the sketch works fine. The...