en route to my Mentor's Studio ... how to record lessons?

[billycar]

I'd like to use what I have purchased (for an early attempt at a music recording setup) ... and am interested in a best setup scenario, in a jazz piano instructor's studio.

I can later convert an analog recording to digital with a home based Mac Quicksilver Dual 1GHz system, that has an M-Audio 2496 PCI audio card. Also have a Mackie 1402VLZPro mixer and 2 Rode NT5 mics for home studio usage only.

For my trip to the Instructor's Jazz Piano Studio, I have 2 ATR20s (see:
http://www.audio-technica.com/cms/wired ... index.html
and a simple RadioShack mixer which allows two mic inputs (but combines them into one channel I believe).

I need to record (and archive) my piano lessons with my jazz pianist mentor. I am thinking 1 ATR20 for the piano and 1 for the Instructor. What is the best placement, and relative settings on my mixer (which I will experiment with)?

Example: Set one mic 1 foot from the piano facing the front of the pinao, and the other pointing in the direction of the instructor (~3 feet from him), approximately 3 feet from the other mic. I would then record into an analog cassette deck (already own) or a digital voice recorder (need to purchase). Set the mixer in a 2:1 ratio ... 2 for the Instructor's mic, and 1 for the piano mic. My Instructor moves from a chair, to my side, on the piano bench, and back, so his mic needs to be able to pick him up in these positions, without encumbering his movement, or requiring him to be self-conscious of his placement. I have a portable roller-backpack, with an extending handle (Instructor "mic stand"), that I am putting all this equipment into, so I'd like to have all my equipment self-contained, and already in place, with minor adjustments required, only for placement optimization and plugging into power.

Is this sufficient? The studio is somewhat live (painted cinderblock walls and carpeted floor with piano and some bookshelves with desk and chairs), and relatively small (10w x 20l x 12h). The sound is somewhat "in a container" or shower, effect.

Suggestions? e.g., buy a good condenser mic (or use the RODE NTs) and portable phantom power, and proceed with either a cassette deck or digital voice recorder?

Other Suggestions? My additional expense budget is ~$225.

I would like to have a good archive of my mentor's lessons.