In article ,
I also have a BC780 and someone commented on the Tape Out jack
being constant volume at line level.

Well, I am at home and I checked again and my sometimes
failing memory was correct. If you do enable the Tape output, you get
audio, all right, and it is fine, but it is effected by the volume
control just like the speaker. It also appears to have a higher
impedance and really didn't sound as good as it does through the
speaker. You also hear the speaker which may or may not be a problem.
--

Martin McCormick WB5AGZ Stillwater, OK
Information Technology Department Network Operations Group