Well I see in forums lot of people get the wrong understanding that mixers can record multitrack, they purchase one, only to find the hard truth, that its not capable of. Alas ... even I am not saved!

. So Flowman, you are not alone

.
I purchased a
Yamaha MW12CX USB mixer about a year ago, not just purely for recording purposes, but also for bit of live music monitoring. I had the opinion then that the multi channels = multi tracks in recording.
But I found later that USB mixers can only record 2 channels (stereo), and by that time it was too late. I have however used for live monitoring and mixing, and also recorded instrumental tracks I created with my
Korg Pa500. So much is fun. But few issues I experienced:
1. It can record only stereo mix (already spoken about). Its only USB 1.1, and not 2.0.
2. Although the instrumental tracks were recorded pretty good (if not the best), the quality of vocal was far from good.
3. Recodings are limited to 44Khz rate only.
4. The DSP effects the mixer board doesnt get cascaded to the audio I was recording. Later after lot of research I found out that that can only be done with an external effects processor, with Aux sends or FX Inserts. None of the documentation mentioned this bit!
Now my only focus is to get the vocal part recorded nicely, and I donot intend to sell this one yet. Now as I understand, the only way to get this is via the audio interfaces. For me 4 channels should suffice for now.
1. I shortlisted few AIs:
Focusrite 8i6 USB/6i6, M-Audio C400 (discontinued), TASCAM US-144MKII.
My heart says Focusrite for their award winning pre-amps as I hear, but my mind says M-Audio for the inserts they have provided, just in case I wish to do some external effects before recording the audio. Now qs is, is it really recommended that way? Or a dry record is always best with the effects done in DAW? The reverb/delay in the monitoring is another greed for the M-Audio, which isnt present both on Focusrite and Tascam.
Any suggestions which one should I go for?
2. If I go for a 6 channel AI, then I really donot need the mixer anymore. But then, are these AI's rough and tough to be taken for live shows?
3. I can also think of retaining my mixer, and only settle for a 2/2 AI. Focusrite 2i2 is the only one I shortlisted, as the M-Audio counterpart on 2 channel offer 44 Khz rec only. Now this might terribly limit my channels, so qs here is.... can a drum + Guitar recorded on a single track using the Guitar-->to Mixer-->to AI --> computer sound as good as (or nearly) the ones recorded with the AI only? Stupid qs may be, but then I can only concentrate on the vocal, and distribute my budget to purchase the one mentioned below.
4. Lastly, Live recording was also in my mind, so I almost had finalised for the
Zoom R8/R16. But that comes at a price! Moreover, I am not sure how the audio pre-amps would be as compared to the AIs. So would anyone recommend to go for R16, which may solve both studio and live recoding? (personally I am still have reservations mixing the two requirements!). So if not, then can anyone suggest a good live recording USB gadget, be it a 2 channel stereo?
Burning qs are, are all these devices compatible with Cubase, which is what I use? M-Audio is too much pro tools, Focusrite comes with something else. So does these have of midi tracks as well? I'll find this out on the DAW side, so the 4 qs above are most imp.
Too many qs

, but all these are constantly hovering my mind, and is holding me to finalize on something! Need help.