The Time Line in Audacity only displays real time (hh:mm:ss) and not
bars and beats, so although there is a "Snap To" feature, it cannot be
used to align loops / single shot samples to beat positions. However,
one way that this can be achieved is to create a label track with each
Attached is a plug-in for Audacity 1.3.x for creating such a label track.
When installed this plug-in will appear in the Generate menu.
(Requires a recent version of Audacity 1.3.x)
Comments, questions, suggestions or other feedback are very welcome.