

Toontrack Solo is just a small host to run Superior Drummer 2 in an almost stand-alone mode. Midi remapping, X-Drums from all EZX and SDX programs in any kit. Superior Drummer2 in host (Toontrack solo?) - Have access to running both EZdrummer EZX & Superior SDX programs. EZDrummer in host (Reaper, or any other one) - Same as above, but can run additional VST, backing track, additional effects, can record. EZDrummer2 as standalone - Very Basic options available. So instead of running all of those things separately, you load them all up within the host and the host uses the ASIO driver. The ASIO driver can only run one program at a time unless you set up an ASIO multi-client server, which I won't even get into here. The reason you would play through a host such as Reaper would be for recording, obviously, but also should you want to run any other VST simultaneously, or some sort of backing track, or add an effect plug-in to your drums that isn't available to you within EZDrummer. You can also reassign any and all of the midi notes that you choose with the midi "Learn" function.

Doing this, you can add kit pieces called X-Drums. To do any of these things, you run EZdrummer2 within Superior2 in standalone mode (or through a host).

My kit's midi layout does not match exactly the way Toontrack has laid out their product. For me, using EZdrummer2 in standalone isn't even an option.
