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Luis, didn't someone already ask you today to adjust your email client? I didn't double and my list reply went to your private address ;-)) That's why I'm forwarding this to the list. ---------- Forwarded message ---------- From: Per Boysen <perboysen@gmail.com> Date: Sun, Nov 9, 2008 at 10:01 PM Subject: Re: New Mackie Pro FX8 usb To: labaloops@yahoo.com On Sun, Nov 9, 2008 at 8:00 PM, L.Angulo <labaloops@yahoo.com> wrote: > Hi gang, > ive been checking out this new compact mixer > http://www.mackie.com/products/profx8/ > i am wondering if i could use it straight with mobius without having a >soundcard in between by simply going USB,how would this differ from a >firewire card like the presonus firebox in terms of latency? any >experiences outhere? > cheers > Luis I have no experience with this particular piece of gear, since it's new on the market, but well some experience with reading product presentations ;-)) The question is how well you can specify on the mixer what tracks to send into the computer and what tracks to send directly to the PA. If this option exists you don't really have to think about latency because you can simply not send your latency vulnerable direct live signal through the whole computer. Rather send it directly out to house PA and snag an effect send bus to go into the computer (with Mobius in your case). Set Mobius to "not monitor input", since you're already monitoring input on the mixer. This means only looped audio will circulate inside Mobius and then Mobius latency compensation will take care of that for you. Well, ok.... the text did not tell about this, although saying twice that "the full mix" can be sent into a computer. However, it says that at the same time a dedicated stream from the computer can go back into the mixer. At least this means that it's talking both ways through the USB port. So, I will have to spend another minute on this then... let's see (donwloading the PDF manual).... Here! The PDF manual says: 5. USB PORT The USB serial I/O interface allows you to transfer digital audio to and from your computer. The interface provides two audio outputs to your computer: • Main mix output, left and right. These output signals are independent of any adjustments made to the main fader [48] and graphic EQ [37]. This allows you to easily record your live performance directly to your laptop. • The USB thru switch [41] allows you to also include the output from your computer in your recording. See page 23 for more details of this switch. The USB interface also lets you use your computer to playback two channels into the mixer: • Left and right signals from your computer are added to the main mix. The USB input level control [40] allows you to adjust the level of the incoming audio from your computer being added to the main mix. See Appendix D on page 32 for more USB details, and also check out the block diagram on page 31. " Well, that didn't answer the question, so let's go to page 32 then, where we find these good news: • Make sure that the DAW's input meters show 2. Make sure the USB thru switch [41] is not pressed in. This will ensure that during each recording pass, the audio software only receives the track-in-progress as an audio signal, and not the pre-existing mix from the computer as well. So, this means that with that button [41] on the mixer not pressed in, you may send your mixer input channel only to the mixer while receiving back two channels (Mobius loops summed output) from the laptop. I take it for understood that there is a way to balance the monitoring of the input and the background and this monitor mix is what you should send to the house PA when using this mixer as the sound card for live looping (seems to be the headphones output). I might be wrong, just scanning the manual on the fly here. Anyway, try it before you buy it ;-) -- Greetings from Sweden Per Boysen www.boysen.se (Swedish) www.looproom.com (international) www.myspace.com/perboysen www.stockholm-athens.com -- Greetings from Sweden Per Boysen www.boysen.se (Swedish) www.looproom.com (international) www.myspace.com/perboysen www.stockholm-athens.com