by Graeme Jaye » Tue Sep 14, 2010 11:21 pm
I'm not an Audacity user, but your problem/s are pretty basic to all software recorders.
The Distortion;
Most likely caused by overloading some part of the input circuitry. If you are using a soundcard that was bundled with the computer, then it might simply be the card is not capable of providing good quality audio. More details of the rest of your gear required here. One thing that does come to mind is, if using a laptop, many only have a microphone input and this is way too sensitive for what you want. In fact, although you might 'get away' with it, even a normal line level input is poorly matched in impedance to a guitar or psg pick-up. Ideally, you need a much higher impedance input than found on most sound interfaces (although there are a few specifically designed for such use).
The Non-sync Problem
This is a result of something called 'latency'. Basically it is the time for required for the analogue signal from your instrument to pass through the electronics and be written to the hard disc as a digital signal. The same sort of thing also occurs on the way back from the hard disc to your monitors. This delay can range from anywhere between a couple, to 10's, even 100's of milliseconds. As long as you can keep latency down to a few milliseconds you should be good to go, once it exceeds 10-15 mS, then you have a problem on your hands.
Reducing latency is very much a 'suck it and see' exercise, as it varies considerably depending on the actual kit in use. You should start by playing around with the buffer size - but that may or may not get you anywhere *. Another trick is to use so-called 'hardware' monitoring. This is nothing more than monitoring your signal on the input side, before it hits the electronics. Reams have been written about this, as it's a problem nearly everyone experiences at some time or another. I suggest using a search engine and look for 'latency' for more in-depth discussion, information and help.
* My own solution to these (and other) computer based recording system problem was to buy a dedicated hard disk recorder - it's still a computer, but one designed and optimised for a single task. 99% of the computer glitches I used to experience vanished overnight and I rarely resort to a computer to make recordings any more.