[FFmpeg-user] Q: How to generate sound file with different frequencies for left/right (alternating)

[ffmpeg at osk.ch]

Hello

I would like to generate a sound file with two frequencies, sinus, one per channel
(left, right) alternating between them. For example: left 0.5 sec 5kHz, then right 0.5 sec 8kHz and so on.
I've spent hours reading ffmpeg docs but am overwhelmed by its power and complexity.

Thanks for your help.
Chris