Now to convert it to a constant tempo for a UserTrack or use in Biab:

Export the the Metronome midi track by dragging the track number to DROP MID.

Drag the Midi into Reaper (Reaper is free to try n try http://www.reaper.fm/download.php ) import the tempo map of the midi file.

Drag the Drum track into Reaper (and instruments).

Create an Action Hotkey to move to next beat and insert Stretch Marker, Actions > Show Action List > New .

View show Master Track.

Right click on Tempo points > select all

Right click on Tempo points > reset points to zero/center

Highlight from start to end.

Item > Snap Stretch Markers within time selection to grid.

Save Track/s to wav

Now you can bring it in Band in a Box, RealBand or PowerTracks with a constant tempo.