1. Open Renoise
2. Create an extra track column in Track 1.
3. Show the panning column
4. Insert "C-4" in first column
5. insert "M0" in the second column's panning column. Something like this:
C-4 00 .. .. --- M0 ..
6. Now use the tool
Result: the instrument number in column 1 will be cleared.
I think the tool should never hide a column if a Mx (Send MIDI command) is in it. It will properly change the way the song sounds (which you would never want when using this tool).
Edited by Drop Shadow, 28 March 2013 - 19:49.