In Preferences, do you have the Zoom set as the Record AND Playback device?
On the track you recorded to what is selected as the output?
Do you have monitors hooked up to the Zoom or are you using headphones?
Do you happen to have any plug-ins or FX inserted or is it just a dry track?
Do you see a waveform on the track?
If you drag and drop a drum loop onto a track can you hear that play?
I'm just trying to see what your signal chain and routing options are and throwing a few things out there so we can have a starting point to work from.
For anyone wondering, this is the
Zoom R8 Mike