Re: More Re: Playing standard kit with DLS synth
Re: More Re: Playing standard kit with DLS synth
- Subject: Re: More Re: Playing standard kit with DLS synth
- From: Jeff Evans <email@hidden>
- Date: Sat, 13 Jun 2009 21:25:43 -0700
Thanks for that helpful bit - I'm trying to use MusicDeviceStartNote
as the primary note-playing method because parts of the software make
use of its ability to do microtonal adjustments. I suppose I could use
MusicDeviceMIDIEvent for the special case of percussion instruments,
but I was hoping there was a way to specify a particular drum kit in
the arguments for MusicDeviceStartNote. Seems like there ought to be...
Jeff
On Jun 13, 2009, at 8:39 PM, Jeremy Sagan wrote:
Hello Jeff,
I don't know about MusicDeviceStartNote but if you just send normal
MIDI to it via
MusicDeviceMIDIEvent
You can send it standard bank and program changes to select different
kits on any channel.
A quick examination shows me that there are 9 kits on bank 1. In order
to do this you may need familiarity with the MIDI spec.
Jeremy
On Jun 12, 2009, at 4:50 PM, Jeff Evans wrote:
This is interesting: I see that if I skip specifying the instrument
and merely specify channel 10 and kMusicNoteEvent_UseGroupInstrument
as the instrument number, I do get the standard kit. Which at least
shows that the DLS synth works for standard kit.
But that precludes specifying a different kit, assuming others are
supported. Does anyone know what value to pass as an instrument
number in order to get
each of the drum kits? Apparently the old constants based on 0x4000
are not operative here...
Jeff
Thanks - Yes, I'm using channel 10. I think. That at least is how I
understand the MusicDeviceStartNote arguments:
MusicDeviceStartNote (synth, //the dls synth
instrument, //instrument i.d. Here I'm using 0x4001 for
standard kit
channel, //"MusicDeviceGroupID" - seems to be equivalent to
channel?
outNoteID, //pointer to note id...
0, //sample frame offset
noteParams);
I always used 0x4001 as the instrument number for standard kit when
doing QuickTime Music Instruments. Perhaps this constant is the
problem? Or maybe I'm misunderstanding the meaning of
"MusicDeviceGroupID" ?
Jeff
On Jun 12, 2009, at 1:26 PM, Brian Willoughby wrote:
On Jun 12, 2009, at 12:56, Jeff Evans wrote:
Using MusicDeviceStartNote I'm unable to get sounds from the DLS
Synth using the "standard kit" percussion instrument (0x4001). Or
any of the other drum kits, for that matter, though I know synths
often don't support more than the standard kit.
MusicDevicePrepareInstrument() returns noErr when asked to prepare
the standard kit with the DLS synth, but then MusicDeviceStartNote
produces the same default piano sound as before. Sort of makes me
think that the upper byte of that word is being ignored and I'm
getting instrument 1 instead.
All other instrument changes work fine, it's only the drum kits
that do not. Does the DLS Synth not support the drum kits? Or is
there some special step needed to select them?
I know very little about DLS, but General MIDI has been around a
long time. Are you sending your MIDI Notes on Channel 10? The
General MIDI standard is to have drums on channel 10, and perhaps
the DLS is expecting this.
Brian Willoughby
Sound Consulting
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