Here is a list of all documented variables with links to the documentation:

• audio_buf_len : sound_task.c, sound_task.h
• audio_buf_ptr : sound_task.c, sound_task.h
• hi2c1 : main.c, lcd.h
• playing : sound_task.c, sound_task.h
• pwm_div_count : sound_task.c, sound_task.h
• sample_index : sound_task.c, sound_task.h