I would call Jim on the phone. He's never returned any of my emails or PMs on the GS site.
He almost always picks up the phone during normal hours of the day (Pacific time zone).
You can reach him by the # listed on his site.
One other piece of not so great info--- I had driven both my Soundcraft Delta console ( he was doing a routine check of the board and rebuilt the Power supply for me) and Tascam down to his place in Carlsbad on MLK Day 3 weeks ago. The Tascam was making a "clock" whine type noise on the right input channel. Jim thought it was either a loose or defective chip he installed. I spoke with him yesterday and he informed me that the company that manufactures the chips, Acoustic Devices are only manufacturing on a limited basis right now so my chips won't be shipped till March 5th
He's very upset about this but nothing he can do. So basically by the time I drive back down there to get it, I will have been without a recorder for probably close to 8 weeks.
If you do spend the dough on the external A/D, you might want to check out the Forssell MADC-2
A few folks that do Acoustic music recording on GS give it rave reviews. One piano player I was in contact with bought both the Forssell SMP-2 pre and MADC-2. He liked the sound better than the newer Nagra VI recorder. You can also call up Fred and talk to him on the phone. Very nice guy. I think he has a 7 day trial period but he said no one has ever returned anything.
This is one route I'm also considering myself except it's pricey, 5K for a 2 channel pre and 2 channel converter. I think for the time being I'll wait to see how much the upraded PS on the Delta helps matters.
That's one great thing about Jim's stuff. The prices are VERY reasonable for the quality you are getting.