Both GoldWave and Sound Forge XP 4.5 only record two tracks. However, if you have a multiple channel mixer, then you can run as many sounds through them as your heart desires. It may take a few tries to get them the way you want, but I sincerely beleive you'll be happy with the results. Keep in mind that you are not recording midi files with multiple channels, but instead, you are recording WAV files directly to your computer. There is a significant difference between midi files and WAV files.
If you wish to record a midi file directly to the PSR-2000, you can do so, save it on a floppy, then play the midi file back through the keyboard and record them as WAV files. You can also simultaneously record vocals. I do all the mixing with a 12 channel stereo mixer, but if you wish, you can really be creative and do the mixing with the program. You can also pan, cross mix and do lots of other neat things. This will take a bit of time to learn, but with a little trial and error, you'll eventually get the hang of it.
There are programs available that will convert midi files to WAV files, however, most will not provide the quality you hear directly from your keyboard's audio output. That is because they do not use the keyboard's tone generator, therefore, the instrument sounds are not the same. This particularly holds true with the "Sweet" sounds that Yamaha has come out with on the 740 and 2000. Those sounds are produced by the by the keyboard's sound card and faithfully reproduced through the keyboard audio output system.
If you have some great midi files that sound outstanding on your keyboard, but only marginal when played on your computer, even a computer with a high quality sound card and great speakers, and you want to make a CD using vocals, Goldwave or a similar program is the best way to go.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)