In the patch below, if I first load a stereo file, and then examine
the buffer (double click), I _see a stereo file.
If I then load a mono file, I see a mono file.
But if I then load a stereo file again, it's only loading one channel.
Same thing if I use the read message to open a stereo file - only one
Is there a way to force the buffer to load the right number of channels?