Volume variance and Bass note key changing.

Is there a simple way to balance the volume of songs?
It seems that I’m constantly having to adjust the volume from one song to the next.

Also…How do I transpose the key to songs that have bass guitar?

Some folks use a volume pedal.

Transposing can be done using the BBM midi editor (which is cumbersome) or you can transpose the bass notes in the midi file using a DAW.