using 2 microphones

[fredvs]

Many thanks for this detailed debug.
I will check (asap) the int16 and int32 multiple input problems.

[fredvs]

If you have it working but with scratch or bad synchro, you may try to tune the latency and buffer length value.

Note too that LCL widgetset "eats" lot of latency, mainly using GTK widgetset who can work a few time and suddenly stop playing or loose synchro.  Maybe try using Qt, I had better result.
(MSEgui widgetset does it much better but this is a other story ;-) )

[trustfm]

Hello i imagined that so i made a thread that called RecordMic RecordSpeakers and had problems too . I do not know if this was helpfull *(it is included at the demo)
But the great news are that
1) Under Linux you can record mic+speakers with the use virtual inputs pulseaudio using one only input @ any samplerate
2) Windows you can record mic+speakers  with 2 inputs at Float32 samplerate=0 :)

Important using butt (https://danielnoethen.de/butt/) (the record option-not streaming) with two inputs at Linux i have similar problems with audio rippling and de-synch ...

Below is a registered audio with butt Linux
trim.uk.to/rec_20250320-185524.mp3

Below is a registered audio with mysimple recorder Linux at Float32 samplerate=0
trim.uk.to/both_25_03_20_18_59_14.ogg