I Found this in another forum:
Use channel mixer, check monochrome box and slide the rules to the channel, to emulate the most common commercial films:
(in any combination the sum must be 100)
Filme..................................Red Green Blue
Agfa 200X...............................18 41 41
Agfapan 25 .............................25 39 36
Agfapan 100.............................21 40 39
Agfapan 400.............................20 41 39
Ilford Delta 100.........................21 42 37
Ilford Delta 400.........................22 42 36
Ilford Delta 400 Pro e 3200...............31 36 33
Ilford FP4 ............................. ..28 41 31
Ilford HP5................................23 37 40
Ilford Pan F..............................33 36 31
Ilford SFX................................36 31 33
Ilford XP2 Super ..........................21 42 37
Kodak Tmax 100............................24 37 39
Kodak Tri-X...............................25 35 40