You can press Control-M to enter a new marker at the current counter location. This can be done during playback or while the sequence is stopped. The key command to enter a new marker can also be changed, using the Commands window.

Alternatively, you can use the "Record hits" mode to enter markers during playback. Go to the Marker window's mini-menu and choose Record Hits; you will be presented with a dialog box to select either locked or unlocked markers. Once you press OK the sequence will begin playing, and each time DP receives a MIDI note it will enter a marker at the current counter location. When you stop the sequence, DP will return to its normal operation.

Note: The "Record Hits" feature is not available in AudioDesk.