Guitar -> MobilePRE –> Mac = Left Channel Only

Discussion in 'Mac Apps and Mac App Store' started by Ratboy, Jan 10, 2004.

  1. Ratboy macrumors member

    Feb 2, 2002
    In giddy anticipation of GarageBand's arrival, I bought an M-Audio MobilePRE USB this morning. I've plugged my guitar into it and it into my Mac via the USB port, however I'm only getting sound in the left channel. This is understandable since the the guitar is sending out a mono signal, but before I go out and buy a 1/4"-mono-to-1/4"-stereo adapter, I thought I'd ask if there was something I was missing. My gut tells me there is.
  2. WinterMute Moderator emeritus


    Jan 19, 2003
    London, England
    If you are using Apple Audio then you only get mono from a mono source, but when attached to a recording system like Garage band I'd expect mono to be pannable across the stereo image, so I don't think it'll be a problem.

    Recording into any decent audio app allows the choice of mono or stereo and indeed which channel for the mono, I think Apple will have followed this for GB.
  3. kenkooler macrumors regular

    Jan 2, 2002
    Mexico City
    I'd wait for your copy of GarageBand to arrive before buying the adapter. No need to buy something you probably won't be needing.
  4. MOM macrumors member

    May 14, 2002
    San Francisco
    In addition, I'm quite sure I saw a slider in GB that lets you set how much of your mono signal goes left vs right. Go look at the screen shots and you'll see what I'm talking about.
  5. rishio macrumors member

    Jan 21, 2003
    I have the same problem with tascam us-122 and soundtrack. I record vocals into soundtrack and the sound only comes out of one speaker. I hope GarageBand doesn't have this problem. Anyone else have this problem in soundtrack and has anyone tested this with Garageband?
  6. Ratboy thread starter macrumors member

    Feb 2, 2002
    Yeah, that's the same problem I had in Soundtrack, so I've been recording into Sound Studio and copying the left channel into the right channel. I'd like to not do that.
  7. Sabenth macrumors 6502a


    Jan 24, 2003
    thats a bit iff that one chanel only thing that sounds like a bug to me bloody hope so. I dont want to be cut paste cut paste all day i want to make music not a word procesor
  8. crazytom macrumors 6502a


    Jul 23, 2002
    Have you tried plugging in the 1/4" mono only half way into the jack?

    When you plug into a stereo jack, if you do it slowly, you'll feel it catch in two places. If you plug a 1/4" half way into a stereo, it should deliver signal to both sides.
  9. TiBook1ghz macrumors newbie

    Sep 25, 2003
    Nonetheless, none of that should be necessary. Just wait until you get GB.

    Everything we record is mono, we create the stereo image when we mix down.

    I just hope it works with my Digi hw. I want this as a sketchpad/practice tool.
  10. Audacity Works macrumors newbie

    Jan 2, 2004
    A mono signal recorded into any stereo recording app is placed (by default) center, i.e. equally between the left and right speakers. Copying a mono source to the right simply wastes space and can cause phase problems.

    For example, you could record ten mono guitar tracks, and send three of the out of the left speaker, three out the right speaker, one 15% right, one 15% left, and two center.

    The only sources that are typically recorded stereo are drum overheads (as opposed to the mic used for kick, snare, and hihat), stereo keyboards (if external and not built into the computer), and sometimes acoustic guitar-- in which case you'd need to use two mics and then pan the appropriate GB channels hard-left and hard-right.

    Vocals, guitars, basses, kicks, snares, hihats, and percussion are almost always recorded mono and then panned wherever later.

Share This Page