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  • Polyphony in a Host App across mulitple VI's

    J
    J
    I am not getting very good polyphony when using VI in host applications

    I have 13 Instances VI hosted in Logic Pro on a G5 dual 2.5 with 8GB RAM. VSL Server is using 2.45 virtual and 2.7 GB real for RAM. My VI instances contain patches from Brass 1&2. My sequencer is sending MIDI to this host G5 via Midi over LAN (MOL). The host G5 has a MOTU 2408 connected to it and audio is coming back to the sequencer computer via light pipe (to another 2408 hooked up to sequencer). Logic's i/o buffer is all the way to 1024, 64 busses is off, Max audio tracks is 4.

    When I sequence triads across horn, trumpet and trombone, I get crackling in between the first chord and the second chord (this is only 9 'voices')...I know the releases are overlapping so it is at least 18 in reality. If I turn release samples off, my host G5 can play these 9 notes with almost no crackling, just barely usable.

    Other Info:
    If I put all 9 notes on one one VI instance there is no crackling
    If my VI instances are hosted in my sequencer there is considerably more polyphony.
    I have substitued RAX and Blogue Bidule as the host app and had very similar if not identical results.

    Any thoughts?
  • S
    S
    John,

    It IS the release samples....if you turn them off things are better..........I run 3 G5's
    and have found that if you go beyond 1.9 gig of RAM used for VIs per G5 things get dicey....

    At 1.9 gig things are fine in Logic for me (+ another 1.5 gig of EXS24 vienna on same computer)

    I'm running 16 instances of VI per G5 (never exceeding 1.9 gig of RAM per computer for VSL-server)

    1st G5 is hosting Logic
    2nd G5 is hosting Plogue
    3d G5 is hosting Plogue

    So recap...my main G5 is running 1.9 Gig of Vienna Instrruments AND circa 1.5 Gig of EXS24 Vienna....(the machine has 7 Gig of RAM)

    my buffer on main G5 is set to 512

    the Plogue G5s are set to buffer 256.

    I feel for you...my ssytem is finally running clean with the above settings / restrictions...

    I turn of release samples for Fast passage apreggio instruments and leave them on for the slow broody ones.

    Hope this helps.

    SvK
  • J
    J
    Thanks for that info, we are still doing a lot of tests here and it does seem that RAM usage is a serious factor in polyphony. I'm thinking of trying an intel mac mini soon as a VI host using PLogue Bidule.

    J