Overdub Input Mute Function (During Playback); Solo Function - Tascam DR-40 Reference Manual

6 – Playback
OVERDUB INPUT MUTE function (during
playback)
SEPARATE MODE
Press the 3/4 [SOLO] button to switch between the input
sound and the 3/4 track playback sound.
After overdubbing, you can use this to listen to the recorded
file.
MIX MODE
Press the 1/2 [SOLO] button to mute the input sound.

Solo function

Press and hold the 1/2 [SOLO] button or 3/4 [SOLO] button to
enable the solo function.
Use for projects that have been recorded in 4-channel mode
and in other cases when multiple files are being played back
to monitor only one of the files.
You can check the solo status with the track status indications.
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TASCAM DR-40