The following material is an excerpt from the README file included with the SoundTracker source package. It is reprinted here courtesy of SoundTracker author Michael Krause.
Note that some functions are only accessible using the keyboard. These are all important key combinations, mostly inspired by the great Amiga ProTracker (most alphanumeric keys are mapped to a piano keyboard):
TRACK EDITOR Right Ctrl Play Song Right Alt Play Pattern Right WinMenu Key Just play current pattern row Space Stop Playing; edit mode on/off Escape Edit mode on/off without stopping playing Shift--Space Toggle "jazz edit" mode F1 ... F7 Change editing octave Left Ctrl-1 ... -8 Change jump value CrsrUp/Down Walk around in current pattern PgUp/Down Walk around in current pattern, quickly F9 Jump to position 0 F10 Jump to position L / 4 F11 Jump to position L / 2 F12 Jump to position 3 * L / 4 Ctrl + 1 ... 8 Change "jump" value CrsrLeft/Right Change pattern column and/or channel Tab Skip to same column in next channel Left Ctrl--CrsrLeft Previous Instrument (faster with Left Shift) Left Ctrl--CrsrRight Next Instrument (faster with Left Shift) Left Ctrl--CrsrDown Previous Sample (faster with Left Shift) Left Ctrl--CrsrUp Next Sample (faster with Left Shift) Left Alt--CrsrLeft Previous Pattern (faster with Left Shift) Left Alt--CrsrRight Next Pattern (faster with Left Shift) Left Ctrl--B Start marking a block (one track horizontally) Left Ctrl--C Copy block Left Ctrl--X Cut block Left Ctrl--V Paste block and advance to end Left Shift--F3 Cut track Left Shift--F4 Copy track Left Shift--F5 Paste track Left Alt--F3 Cut pattern Left Alt--F4 Copy pattern Left Alt--F5 Paste pattern Delete Clear part of the channel the cursor is over Backspace Delete current position and pull rest of track upwards Insert Shift rest of track downwards and insert a row Any other keys Play notes on the keyboard.
If SoundTracker is unable to configure the notes on your keyboard on its own, you must use the Keyboard Configuration dialog to set up your keyboard. In any case, there you will also have to configure the key that inserts the “key off” note into a pattern.
Some of the other shortcuts can be changed in the usual GTK+ way—go to the relevant menu entry, put the mouse over it and, just before releasing the mouse button, hit the desired key combination!
Hold Shift and use left/right mouse buttons to set the loop points in the sample display.