Hi Glenn,
I mainly utilise the DAT machine for its analogue to digital converters and to bypass the onboard mic pre-amps on the Roland. The mic pres on the Tascam are supposed to be quite good. Also, going into the HD recorder digitally does make the recording process a bit quicker and easier for me.
However, there is at least one song on my website which was recorded (both sounds and vocals) straight into the HD recorder... 'Unchained Melody'.
I read once that performing a DC offset correction (I missed out the essential word 'correction' on my last post) was a recommended step after recording a wav file. I found this that will explain it better than I could:
'If the average between the positive and negative wave peaks in your file is not zero, the result is inaudible low-frequency distortion. Although you won't be able to hear it in the .wav file, it will seriously degrade your compressed file, as well as introduce further distortion if other filters are applied to the uncorrected wave. The DC offset function corrects this problem, and should always be applied as the first step in optimizing an audio file..'
Also:
'A condition known as DC offset can occur in sound files that were recorded with improperly grounded sound cards. This problem is more common with low-end sound cards. DC offset forces the baseline of the audio signal to be offset from the centerline. You can determine if this is a problem on your system by recording a few seconds of silence and zooming in on the signal and checking to see if it’s centered. Most sound editing programs have filters that can correct a DC offset.'
I've just performed that test and the signal was indeed centered, but I'll still carry out the DC offset correction just as a precaution.
This recording lark (as you're probably finding) is an ongoing, but enjoyable learning process. Something I need to investigate further is the use of compression. I haven't used it in (or after) recording yet... so may experiment with that sometime.
Give me a shout again if you have any other questions or queries... I'll help out where I can.
All the best,
Rich