Thanks! The seventies weren’t too bad for baritones, but the eighties had almost none!

One trick I have if I need to drop an audio backing over a third is to transpose the bass part down the third AND up the sixth. Then I can cut and paste between the two if parts of the bassline drops well bellow the bottom E string. This can sometimes save a track, other times you just have to roll up your sleeves and record a new bassline that sits in the standard range!

I’ve also rescued guitar parts that get muddy if you take them down a third or more by mixing together the down pitched part with one transposed up the sixth. Just EQ out the low end of the up-transposed track and mix it in quietly just to put a bit of sparkle and transient clarity back in.

Transposing audio down can be tricky if you need major third or more!