The cd/mp3 input is not sent to your DAW over usb from the HD500. It remains an analog signal - never digitized - and is sent directly to the HD500 outputs.

In order to record that using the HD500 you would need to connect your drum output to an HD500 input (e.g. Aux, Guitar), select that jack as your input for HD500 processing, and then apply no amp/fx in the signal chain for the preset.

I'm not 100% sure whether there is a stereo input in the HD500. I don't think so, which means you would have to mono-ize your drum device output so that you don't lose half the signal as it enters the HD500.....

....OR ...  get a stereo-to-mono splitter and send one channel each into the HD500 Aux and Guitar inputs. Create a dual-path preset (still no amp/fx) with seperate inputs to keep the channels separate as they go through the HD500. This should give you the original stereo signal over usb to your DAW.

tdk24 wrote:

 

....Since the HD500 is basically a usb audio interface.....

Actually, it is basically a guiitar multi-fx processor. It happens to also act as a device-specific audio interface for itself.

You would get best results recording your drums by using a true general purpose audio interface device rather than the HD500. However, you will still get good results using the HD500 by setting things up as described earlier. The signal will undergo an unnecessary A/D and subsequent D/A conversion but that shouldn't affect things too much.

I assume the drum kit has a pair of standard 1/4" outs (L+R).

Connect these into the FX Loop Return.

In a blank patch add only a FX Loop effect and set it with Mix at 100% - play with gain levels so that nothing is being overloaded.

Whatever comes in throught the FX Loop return is now on the internal signal path of the HD 500 and can be recorded over USB