Add "export every single channel"

[MrZ626]

When selecting wav/mp3/mid in exporting menu, show an extra checkbox says "export every single channel" (or "split channels" for short) So I won't have to export each channel one by one

[amytimed]

How about "Export separately"? The name sounds like it's saying some channels won't be exported if you don't tick it

[Mid-The-Modder]

Not a bad idea at all, especially for people who like using oscilloscope programs to demonstrate their songs. Shouldn't be too difficult either, just at the cost of a long download time for each channel.