[quote name='discreet' timestamp='1342178476' post='1730871']
Always by ear. I start by listening to the target track at low volume while I'm doing something else (Basschat!). I'll play it maybe twenty or thirty times depending on whether it's something I'm already familiar with and how complex the line is.
Then (usually next day) I'll pick up the bass, get a rough idea of the arrangement and attempt the bassline. I'll listen to the track about fifty or so times during this process.
Then I'll separate the track into logical sections and listen very closely to what is happening in each, refining the line as I go and getting a handle on exactly what I [i]think [/i]is being played.
If I can, I'll leave it for a day or two and come back to it fresh. Inevitably I'll realise what I've come up with so far is [i]nothing [/i]like what's actually being played on the recording. This is when I usually 'get it'. At this point I'll rehearse with the recording and run through it as many times as I can stand without going nuts (usually a [i]lot[/i] of repetitions) so I can play it without thinking (this lets me concentrate more on the phrasing, the groove, all the 'non-note' stuff, if that makes sense...
I find when listening to bass lines it can be useful to play the target track at varying volume levels, listen to it from another room or from downstairs, or even from outside - there is [i]always [/i]something going on that you'll miss, regardless of how many times you play the recording at one level.
I admit I am pretty anal though, and in some of my previous covers bands my forensic technique usually led to me being very disappointed with the crappy efforts of everyone else in the band, so be careful! Not a problem with my current band though, who are tragic geeks.
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We must have been seperated at birth cos i am equally anal. The rest of the band have stopped trying to blag their way through stuff too as i sometimes learn their parts too! Sometimes, i need the score or a tab to work out the line but in the main its lots of listening and a little playing.