Did you already tried:
Out Channels
Output(L) 1:1
Output(R) 1:2
Output(L) 2:3
Output(R) 2:4
Output(L) 3:5
Output(R) 3:6
Output(L) 4:7
Output(R) 4:8
Output(L) 5:9
Output(R)5:10
In the mixer you can use buses in a configuration like the screenshot:
Output 1 = Left drum mix (See the bus sends to the buses …ST for stereo mixing)
Output 2 = Right drum mix (See the bus sends to the buses …ST for stereo mixing)
Output 3 = Kick (note the panning on the bus to left)
Output 4 = Snare (note the panning on the bus to right)
Output 5 = Toms (note the panning on the bus to left)
Output 6 = Hihat (note the panning on the bus to right)
Output 7 = OH Left (note the panning on the bus to left)
Output 8 = OH Right (note the panning on the bus to right)
Output 9 = Ambience Left (note the panning on the bus to left)
Output 10 = Ambience Right (note the panning on the bus to right)
Greetings Wouter
Dear Jack and Jordan,
Thanks to your input/reaction it gave me the idea to try something with the macOS “Multi output device” setting and this works.
Step 1
Now I have to select only the audio interface I want to use for the situation that I am (Audio interface at Home TD50-X, Practice location band QU-SB or QU-32 Live performance).
Selection from the menu to be made : TD-50X, QU-SB Audio or QU-32 Audio
Step 2
Start SD3, choose the stored Project with the right mixer preset and Start Drumming!
Settings in SD3
In the SD3 Audio/MIDI Setup… menu the settings are set to:
Output Device “Audio Interfaces 32ch”
Out Channels for the last time 32 channel reconfiguring
With this solution the 32 channel configuration is not resetted anymore, when I change to another connected audio interface.
No more manually readdressing 32 channels anymore 🙂
Thank you Jack for your response!
It is good to talk about it to make it more clear and maybe somebody knows a better way or work around.
The renumbering is here in SD3 Out Channels -> Selection “Use multi-out”>, so this is not an macOS audio management menu:
Channel 1 to 32 I have to do it manually for all the 32 outputs, sitting behind my drum kit without the computer straight in front of me.
So this is not so comfortable action to do in preparation setup 😉
Kind greetings Wouter
Thank you all for your input and suggestions.
I looked to what is mentioned and it is not an Audio management or macOS thing, these are working good and are set in the right way.
Only one interface is connected, for the output of the sound.
The further specific mixer/audio interface settings I made with the “User Presets” function.
This is used for the correct routing for the interface I use at that time (see example picture when the audio goes to the Roland TD-50X).
To make clear I don’t want to call it an SD3 issue, but maybe an improvement/new option suggestion 😉
Standard way of coming up of the SD3 Audio/MIDI Setup… -> Out Channels -> Selection “Use multi-out”> is by default:
Output(L) 1:1
Output(R) 1:2
Output(L) 2:1
Output(R) 2:2
Output(L) 3:1
Output(R) 3:2
It should be nice if you can “toggle” this from the default output numbering 1 and 2, to 1,2,3
Output(L) 1: 1
Output(R) 1:2
Output(L) 2:3
Output(R) 2:4
Output(L) 3:5
Output(R) 3:6
Output(L) 4:7
Output(R) 4:8
With this last output numbering setup I can control everything with the made “User Presets” function.
TD-50X 
QU-SB 
QU-32 