Implement fader instead of sample multiplier.

Add notch-filter with q,f and g sliders. Preview needed. Use this notch filter in the auto calculation.

Save instrument settings.

Make multiple instruments in the same session and save them in one session-file.

It seems that the “prefix” entered in the editor is somehow added twice to the names in the xml files.

Selection deletion (aggressively) sometimes results in a segfault.