Mono to Stereo in 2025

[d.healey]

Hi,

I remember going through this hassle and I thought I posted the solution somewhere but I can't find it now.

Anyway, this is how I have Sordina set up and it shows up correctly with both mono and stereo and mono -> stereo options in Logic.

Within project preferences, I have Support Mono FX checked, and Force Stereo Output unchecked.

For AU you need to add HI_SUPPORT_MONO_TO_STEREO=1

For VST3 you don't need this.

[orange]

@whoopsydoodle I'm not sure why you're using it, but since you're using Force Stereo, it forces the plugin to be stereo and prevents you from using it on mono channels.

You can try by deactivating Force Stereo.

[whoopsydoodle]

I don't want mono > mono. Only mono > stereo and stereo > stereo.

I definitely saw something somewhere saying the way to enable m > s was with the mono input and force stereo output. But I'll try without force stereo!

[d.healey]

@whoopsydoodle said in Mono to Stereo in 2025:

I don't want mono > mono.

What if the user uses a mono track with a mono output?

[whoopsydoodle]

@d-healey it's my understanding that logic and pro tools support mono to stereo where a mono track becomes a stereo track at the insert point where the user inserts an m>s plugin.

this plugin does not make sense to run as mono > mono.

[d.healey]

@whoopsydoodle I just tested and if I add a track with 1 in and 1 out in Logic, Sordina shows up as Mono -> Stereo.

If I add it to a stereo track I get the Stereo option

So the settings I gave above should do what you need.

[orange]

@whoopsydoodle said in Mono to Stereo in 2025:

I don't want mono > mono. Only mono > stereo and stereo > stereo.

I definitely saw something somewhere saying the way to enable m > s was with the mono input and force stereo output. But I'll try without force stereo!

You need to export 2 different versions for this purpose. One plugin for "Mono to Stereo". The other one will be the "Stereo".

• Mono to Stereo: Like said before, don't use the Force Stereo option. HI_SUPPORT_MONO_TO_STEREO=1 and Support Mono FX combination will to the job for "Mono to Stereo" option.

• Stereo : Delete the HI_SUPPORT_MONO_TO_STEREO=1 and untick the Support Mono FX. Then the plugin will be stereo only.

This is only for AU and AAX plugin versions. Also don't forget to use the different Plugin codes for m to s and stereo versions. Otherwise Logic & Pro Tools only use one version.

The detailed info is here: https://forum.hise.audio/topic/1632/support-for-mono-to-stereo/10?_=1742247113670

[d.healey]

@orange said in Mono to Stereo in 2025:

You need to export 2 different versions for this purpose. One plugin for "Mono to Stereo". The other one will be the "Stereo".

You only need a single plugin. The correct config will be chosen by Logic/Pro-Tools depending on the track settings.

[orange]

@d-healey said in Mono to Stereo in 2025:

@orange said in Mono to Stereo in 2025:

You need to export 2 different versions for this purpose. One plugin for "Mono to Stereo". The other one will be the "Stereo".

You only need a single plugin.

• He wants "Mono to Stereo". So 2 versions are mandatory in this case.
• One version is valid for: For "Mono to Mono" & "Stereo to Stereo"

At least, that's how we've been using it since Christoph added this feature - unless a new option has been added recently.

[d.healey]

@orange said in Mono to Stereo in 2025:

No. He wants "Mono to Stereo". So 2 versions are mandatory in this case.

See my post with images above, I only have 1 Sordina 2 plugin.

[orange]

@d-healey said in Mono to Stereo in 2025:

@orange said in Mono to Stereo in 2025:

No. He wants "Mono to Stereo". So 2 versions are mandatory in this case.

See my post with images above, I only have 1 Sordina 2 plugin.

Since when has it been like this? Is this why the recently added Force Stereo option was added?

At least, above, that's how we've been using it since Christoph added HI_SUPPORT_MONO_TO_STEREO feature - unless a new option has been added recently.

[d.healey]

@orange I've been using it since at least 2023

[orange]

@d-healey said in Mono to Stereo in 2025:

@orange I've been using it since at least 2023

I've been using since 2019 ahaha Time goes fast and everything changes :))

[whoopsydoodle]

Unfortunately I still can't get it to show up as m > s.

Ive tried many combinations but the last one that still didn't work is:

Support Mono FX [checked]
Force Stereo [unchecked]

HI_SUPPORT_MONO_TO_STEREO=1
added to Windows and Mac Extra Definitions fields

Forget my comment about compiling outside of Hise, I can't even get it to work leaving that part out and compiling normally.

It's a real pain doing this over and over having to clear out the AU cache every time. Logic really kinda sucks for development.

[d.healey]

@whoopsydoodle said in Mono to Stereo in 2025:

added to Windows and Mac Extra Definitions fields

Just Mac and only for AU not VST3, you don't need it for Windows.

[whoopsydoodle]

@d-healey AAX windows?

[d.healey]

@whoopsydoodle Give me a moment, I'll check what I did there - it's been a while

[orange]

@whoopsydoodle said in Mono to Stereo in 2025:

@d-healey AAX windows?

Yes for Windows AAX, it is the same like macOS.

[orange]

@whoopsydoodle
You might need to clear the AU cache.

[whoopsydoodle]

@orange I've been deleting the com.apple.audiounits.cache in user library. I'm always unsure if I also need to reboot after that.