Just got the LM-3204... damn nice sound! ... there is no question this will replace my ONYX 24.4 console now.
Only a few problems... seller forgot to tell me that an LED in the VU meter was dead, and that the Control Room fader crackles like shit... clearly also a unit from a smoker, because the knobs that should be white on top, are yellowish, so I'm going to have to make some fixes... better get that soldering iron hot, and get me some contact spray for that fader.
But this is REALLY a sturdy and very VERY flexible unit... has everything I need in a 5U rackmountable package.
Then I can finaly remove that big sturdy wooden table that My ONYX was resting on... my girlfriend also wants to use it for other things

But I can warmly recommend this mixer to anyone who needs lots of inputs, and want stereo controls. No need to constantly adjust two channels to configure a stereo channel.
The specs are as follows:
Channel strips:16 stereo channels
4 AUX sends switchable between two pairs... one pair having a stereo and mono send
3band EQ controls
Balance control
Gain control
Solo button
Mute/Alt 3-4 button (Alt 3-4 is a typical Mackie trend for routing a channel to a stereo output on the back... will go to my sampler)
Master Section:4 stereo AUX returns (nice for getting four FX units back in the mix)
Solo Volume
Phones Level
Master L/R faders
Control Room fader
Source ALT 3-4 button for routing the ALT 3-4 signal to AUX Return 3
AUX Return 4 to control room only switch
Tape Monitor switch
And on the back of the unit:Inserts jacks on four first channels (stereo of course)
Master insert jacks
Tape Input/Output (both RCA and Jacks)
2 Mic Preamps with gain control and jack outputs
Connector for connecting an LM-3204E expander for another 16 stereo channels