[CD-i] Sound mixing not faithful to the real machine

[Slamy]

MAME version

0.270 (mame0270-59-g9c54072486b)

System information

Debian 12

INI configuration details

No response

Emulated system/software

CD-i (cdimono1)

Incorrect behaviour

Multiple mono audio sources are played back with total stereo separation. For example, Zelda - Wand of Gamelon has the BGM on the left and SFX on the right.

Expected behaviour

Zelda - Wand of Gamelon has the BGM and SFX mixed on both channels.

Steps to reproduce

Play some Zelda - Wand of Gamelon and experience it during while playing a 2D level

Additional details

No response