Q: Yamaha DTX522 e-drums output question

Hi all - I am considering buying a Yamaha DTX522 electronic drum kit to record with however i'm confusing myself with actually HOW to do it, given the outputs on the Yamaha module. I am a newbie so please bear me and correct me i'm wrong. I currently have an old Presonus firewire FireBox (they don't even make these anymore) interface, and Logic Express on a Mac Mini. I understand i can either record by using the Audio Outs (1/4") of the yamaha module, into the Firebox. Doing it this way i'd have to be happy with all the settings/sounds on the yamaha module and it would be recorded as one track. However if i wanted more control over each of the drum pads (sounds, volume, etc) and track each drum pad indivudually, i could use MIDI out from the Yamaha module, into the MIDI IN on the Firebox and track through Logic Express using some sort of drum VST. Is this correct?

My question is regarding the outputs on the Yamaha module. I see it has the regular Audio Outs, however i'm not sure what "USB TO HOST" is. I don't see MIDI OUT. Does anyone know what USB TO HOST does? I've asked suppliers and they don't really give a clear answer. My main goal is to be able to record each drum pad individually (like using MIDI out to the Firebox to Logic). Would i be able to do the same thing using this USB TO HOST output? I don't understand how i would even connect a USB cable to the Firebox if that's what I should do and if that allows individual tracking at all. Thanks!!!!