Just in case, someone is interested... Feel free to redistribute the information, if you like to.

List of MSX tR default CALL commands sorted by slots (Made By: NYYRIKKI 2005)
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#0-2	(MSX-Music)
-------------------

AUDREG
APPEND MK	*
APEEK		*
APOKE		*
BGM
CONT MK		*
COPY PCM	*
CONVP		*
CONVA		*
INMK		*
KEY ON		*
KEY OFF		*
LOAD PCM	*
MDR
MK VOICE	*
MK VEL		*
MK VOL		*
MK TEMPO	*
MK STAT		*
MK PCM		*
MUSIC
REC PCM		*
STOPM
SET PCM		*
SAVE PCM	*
SYNTHE		*
TRANSPOSE
TEMPER
VOICE
VOICE COPY
PAUSE
PLAY
PLAY PCM	*
PCM PLAY
PCM REC
PCM FREQ	*
PCM VOL		*
PLAY MK		*
PITCH


* Detected, but not supported (causes illegal function call)


#3-1	(Kanji ROM)
------------------------

PALETTE
CLS
AKCNV
JIS
SJIS
KACNV
KEXT
KINSTR
KLEN
KMID
KNJ
KTYPE
KANJI
KANJI0
KANJI1
KANJI2
KANJI3
ANK

#3-2	(Disk ROM)
------------------------

SYSTEM
FORMAT
CHDRV		*
CHDIR		*
MKDIR		*
RMDIR		*
RAMDISK		*


* Only when DOS2 is active.


#3-3	(Panasonic Mapper)
------------------------

MWP		*
HIRO		**


* Only in Panasonic FS-A1GT
** Only in Panasonic FS-A1ST

(CALL MENU in Panasonic 2+ machines)