Combine 2 mono audio channels into 1 stereo audio
Feature Idea
Hi, I would like to have the possibility to combine 2 (or more, if possible, but at least 2) mono audio streams to one stereo (or multichannel if we are talking about more than 2) audio files. Practically I want the opposite of "Split Audio Channels" node. "Audio Merge" is not doing that but it is mixing 2 audios into one mono audio (using different selectable methods to do the mix). "Audio Concat" is stitching together 2 audios one after the other, the result is still mono but double in length.
Of course, I can do this in multiple ways outside ComfyUI but it I would be handy if I could do it also inside.
Searching for a custom node with this kind of functionality I found https://www.runcomfy.com/comfyui-nodes/SaltAI_AudioViz/SaltAudioStereoMerge but it gives 404 error when I try to find the repository link.
I hope my feature request is justified and it is not the case that the feature is already in ComfyUI but it's me that I couldn't find it and I need a new pair of glasses. In that case "User support" would be more apropriate for this issue.
Existing Solutions
https://www.runcomfy.com/comfyui-nodes/SaltAI_AudioViz/SaltAudioStereoMerge (Probably, from what is described in the page, but the link to the actual repository is 404)
Other
No response