When I listened to the 2 UAD FX files (I feel like you can't compare the other 2 with them due to the fact that they are colored with the plugins) I really do like the overall sound of the UA apollo
overall. They are fairly similar, but if you really listen a few times over between the 2, you'll notice the Duet
Martech combo is kind of harsh on the high end and it lacks warmth in the mids and low end compared to the UA apollo
clip. I noticed the biggest difference between the 2 in the little country riff played at 1:10 on the UA clip and 1:02 on the Duet
Martech UAD Clip. the riff on the UA is warm, crisp and the low and mids are nice and beefy. The Duet
lacks the beefy mids and the lows sound a little muddy, and what really stands out that I can't stand to the UA is the high frequencies are distorted and harsh and you can hear all the little string hits and picking too much. The UA clip has a smooth top end that is clear but not overbearing, it almost rolls the high frequencies off at a certain point which seems to clear out the nasty little picking and string sounds that you don't want to hear. I'm sure if you EQ'ed the Duet
track you could get basically the same sound but the whole point is to have that nice sound right out of the interface without having to enhance or clean up with plugins or outboard gear. Thanks a lot CowboyCoalminer for doing the comparison, I have been curious to what the UA apollo
was going to sound like and now that I've heard it and compared it to something I'm familiar with I have a good idea of what it's capable of. I think I'm gonna go to the music store and play with one!