houhaiyan

@stwirth hello, the gain increase/decrease is linearly. Nonlinear is unsupported. Maybe the clicking is because any channel stream is blocked before down-mix. You can increase ring-buffer waiting data time using...

@stwirth Maybe the clicking is because two pipeline reading the one file, file system will be blocked. . 1. copy "/sdcard/440Hz_44100Hz_16bit_05sec.wav" to "/sdcard/440Hz_44100Hz_16bit_05sec_copy.wav" 2. ` audio_element_set_uri(base_fatfs_reader_el, "/sdcard/440Hz_44100Hz_16bit_05sec.wav");` ->` audio_element_set_uri(base_fatfs_reader_el, "/sdcard/440Hz_44100Hz_16bit_05sec_copy.wav");`...

@stwirth  [test.zip](https://github.com/espressif/esp-adf/files/7343542/test.zip) I do some modification for https://gist.github.com/stwirth/367fba0c07dd7bd3567be11dcf889c48#file-main_write2-c) I don't find the clicking

@crazydiamondzgy Please provide your test code

@f4lc0n-asm We have synchronized your test to GCC folks and will inform you as soon as there is any news