add more than 4 virtual midi devices
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Ok, I've done the required changes... now show me your content!- Macro DuPont
- Posts: 2
- Joined: 3 Gen 2021 - 08:18
- coolsoft
- Posts: 1972
- Joined: 25 Mar 2012 - 01:19
From what you wrote I suppose you use different devices to have different SF2 configurations.
Do you really need more than 4 different soundfont configuration at the same time?
I mean, couldn't you switch from one configuration to another by using SF config import/export feature?
Anyway, increasing the number of devices is not so easy...
VMS creates a Fast IPC Queue (within shared memory) and a separate rendering engine (synth) for each device.
To achieve a smooth rendering, each queue and engine should be assigned (and executed) to a different CPU core.
The 4-devices limit is a good compromise between performance and quality:
- most of the users have a single virtual device config on a 2-cores CPU (1 queue + 1 engine)
- advanced users have a 2 virtual devices config on a 4-cores CPU (2 queues + 2 engines)
- going up to 4 virtual devices causes queues and engines to be "interlocked", so an high-level CPU (core-i7 or higher) is needed
Additionaly, other tasks are present on the PC, like the MIDI client (player), Windows OS and its background activities, ...
This is why I still think the 4-devices limit is reasonable 😉.
- Macro DuPont
- Posts: 2
- Joined: 3 Gen 2021 - 08:18
Sorry for replying until now, but I'm hard working on my project.
Yes, you're right, I do use the 4 different sf2 configurations at the same time, and I do actually need to be able to use more, all at the same time; and no, I haven't faced any kind of problems, slowdowns or stuttering. As I stated before, I may just compile a soundfont or two with the banks I prefer from the soundfonts I use and all the stuff I need, but is too time consuming, so I considered asking you to add more devices; sadly it's too much work to you too, and I dont want to be annoying, so if still knowing I leave the workload to my soundcard, and I don't actually face any issues when using all the 4 midi devices at the same time and could use more without any problem, you do still believe adding more devices is not worth the effort, I will be completely okay with it and won't ever ask again 😊
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