Hi (again) dwarzala... just replied to your post about getting a bass in another thread.
Before I got my bass, I was in the same situation as you... trying to use my regular guitar to do bass parts. Here's how I went about doing it (copied from an older post in another thread....)
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I have been using my regular guitar to come up with and to record bass parts. The results can vary, but I'm finding it surprisingly effective.
I don't have a fixed forumula for doing this. But basicly and most recently, I use the neck pickups with an appropriate tone control setting and send that into a bass-boosting patch in my POD X3 -- not one that actually tries to shift the octaves (which as other have said has its limitations), but one that just boosts low end and fattens and rounds the sound. My guitar has an additional 6db boost knob at (I think) 650Hz that I use to fatten it up. I then tweak the various settings in the POD, including the EQ and compressor modules, to deepen and round out the sound. This gets me closer to a basic (and relatively "unprocessed", so to speak) bass sound.
I then do additional processing in Sonar. I use EQ and additionl compressing, amp and/or tape sims, and so on to further sculpt the sound. I've tried transposing down an octave, but I don't find it as effective.
Definitely, there are certain kinds of bass sounds that cannot be gotten this way. But it can work depending on your needs. It's also an interesting process.
With real bass, or even with sampled bass, one of the issues is how to process/shape/sculpt it so that it fits in the mix. This typically involves rolling off some low end, compressing, maybe shaping the mids to bring out the upper harmonics, and so on.
Doing bass with a regular guitar, which is an octave higher, the issues are a kind of mirror image: you need to increase the low end, without overdoing it; while the mids are already more present, but you don't want them to sound too thin or bright and "guitar"-like. In both cases the sound needs to be shaped and made to work with the mix. The issues are pretty much the same, only you approach them from a different angle.
The fact that regular guitar strings have a smaller vibrating mass than bass strings is no small factor -- I think that's why some kinds of sounds seem beyond this approach.
But overall, I'm finding that it works nicely for what I'm doing, which is some kind of rock -- not super uberheavy, but not too lite either.
Importantly, I find it much easier to get the kind of bass parts that I like by using a guitar than by using a keyboard... the articulations are much better, and that alone helps make it work. You just have "think bass" when you're doing it.
FWIW.
post edited by Marah Mag - 2008/09/29 20:48:15