iOS Sameboy "Enable audio: Always" option produces sounds even on zero sound volume

[lpla]

I noticed, in a completely silent room, that iOS Sameboy with "Enable audio: Always" (phone in silent mode or not, and media volume at zero) still produces game sounds at a very low volume. This doesn't happen if I switch settings to "Enable audio: Controlled by Silent Mode".

I'd say this happened since the first iOS release up to the current one.