[quote name='neepheid' timestamp='1368534999' post='2078081']
If I have to learn a pre-existing song - take song into Audacity, bass boost it, then chuck it up an octave. Bass line (an octave higher) verily pings out at you. Learn it up there, then take it back down on the bass.
[/quote]
Thanks, going to try that! On average I'm learning around a song week so anything to help work them out is welcome.
For the poll I've chosen the 'muscle memory' option but really I just play the song over and over on headphones whenever I can and play along to it as often as I can in the time. Long process, but there are rarely short cuts, even if getting good at it shortens the time required.