Squeak,
The range of frequency reproduction on tape
is approx between 55Hz - 16500Hz, if used good tape!
This is within the range what a child's ear can hear, the older you get the less it becomes.
If you use a pro 4track taperecorder, this is good enough and compares to old Revox A77 recordings.
You will notice that the dynamics seem to sound better/deeper as a digital recording.
This is caused because the frequency reproduction is fluctuating on tape and on strongest on the points where we would use compression in digital recordings.
A digital recording is flat and has no fluctuation other then sound peaks, but is not limited in reproduction and which is not the same.
The outcome is that tape seems to have more dynamic. confusing eh
I hope I clarified a bit as this is pretty tough explaning in english.
Fred