I am afraid that this will be the longest thread ever posted on this Forum; I have copied from the VA 7 manual the list of the available MFXs: it's in italian, and I have tried to translate whenever possibile:
every effect has two parameters that can be controlled with the two sliders M-Value 1 e M-Value 2 on the display. Parameters marked with an asterisk (*) can be controlled with an optional footswitch.

TONE COLOR (filters)
01 Enhancer M-Val 1° Sens 0~127
M-Val 2 Mix 0~127
02 Humanizer M-Val 1° Vowel a/i/u/e/o
M-Val 2 Level 0~127

GUITAR AMPLIFIER EFFECTS
03 Overdrv1 (Small) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
04 Overdrv2 (Bltln) M-Val 1° Drive 0~127
M-Val 2 Pan L63 ~0~ R63
05 Overdrv3 (2-Stk) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
06 Overdrv4 (3-Stk) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
07 Distort1 (Small) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
08 Distort2 (Bltln) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
09 Distort3 (2-Stk) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
10 Distort4 (3-Stk) M-Val 1° Drive 0~127
M-Val 2 Pan L63~0~R63
MODULATION EFFECTS (EXCEPT CHORUS)
11 Phaser M-Val 1° Manual 100Hz~8.0kHz
M-Val 2 Rate 0.05~10.0 Hz
12 Auto Wah M-Val 1° Manual 0~127
M-Val 2 Rate 0.05~10.0 Hz
13 Rotary *M-Val 1° Speed Slow/Fast
M-Val 2 Level 0~127
14 StFlangr M-Val 1° Rate 0.05~10.0 Hz
M-Val 2 Feedback -98% ~+98%
15 SpFlangr M-Val 1 Feedback -98% ~+98%
M-Val 2° Step Rate 0.05~10.0 Hz
16 Tremolo1 (Tri)
M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
17 Tremolo2 (Sqr)
M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
18 Tremolo3 (Sin)
M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
19 Tremolo4 (Saw1)
M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
20 Tremolo5 (Saw2)
M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
21 AutoPan1 (Tri) M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
22 AutoPan2 (Sqr) M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
23 AutoPan3 (Sin) M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
24 AutoPan4 (Saw1) M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
25 AutoPan5 (Saw2) M-Val 1° Mod Rate 0.05~10.0 Hz
M-Val 2 Mod Depth 0~127
DYNAMIC EFFECTS
26 Compress M-Val 1° Pan L63~0~R63
M-Val 2 Level 0~127
27 Limiter M-Val 1° Pan L63 ~0~ R63
M-Val 2 Level 0~127
CHORUS
28 Hexa Cho M-Val 1 Rate 0.05~10.0 Hz
M-Val 2° Balance D>0E~D029 Trem Cho M-Val 1° Trem. Rate 0.05~10.0 Hz
M-Val 2 Balance D>0E~D030 StChorus M-Val 1° Rate 0.05~10.0 Hz
M-Val 2 Balance D>0E~D031 Space D M-Val 1 Rate 0.05~10.0 Hz
M-Val 2° Balance D>0E~D032 3DChorus M-Val 1 Cho. Rate 0.05~10.0 Hz
M-Val 2° Balance D>0E~D0DELAY & REVERB
33 St Delay M-Val 1 Feedback -98% ~+98%
M-Val 2° Balance D>0E~D034 Mod Dly M-Val 1 Mod Rate 0.05~10.0 Hz
M-Val 2° Balance D>0E~D035 3Tap Dly M-Val 1 Feedback -98% ~+98%
M-Val 2° Balance D>0E~D036 4Tap Dly M-Val 1 Feedback -98% ~+98%
M-Val 2° Balance D>0E~D037 TmCtrDly M-Val 1° Dly Time 200m-990m/1sec
M-Val 2 Feedback -98% ~+98%
38 Reverb M-Val 1 Time 0~127
M-Val 2° Balance D>0E~D039 GteRevNr
(Normal gated reverb)
M-Val 1° Balance D>0E~D0M-Val 2 Level 0~127
40 GteRevRv
(Reversed gated reverb)
M-Val 1° Balance D>0E~D0M-Val 2 Level 0~127
41 GteRevS1
(Sweep 1)
M-Val 1° Balance D>0E~D0M-Val 2 Level 0~127
42 GteRevS2
(Sweep 2)
M-Val 1° Balance D>0E~D0M-Val 2 Level 0~127
43 3D Delay M-Val 1 Feedback -98% ~+98%
M-Val 2° Balance D>0E~D0PITCH SHIFT
44 2PitchSh M-Val 1 Coarse1 -24 ~0~ +12
M-Val 2° Coarse2 -24 ~0~ +12
45 Fb P.Shf M-Val 1° Coarse1 –24 ~0~ +12
M-Val 2 Feedback –98% ~+98%
OTHER EFFECTS
46 3D Auto M-Val 1° Speed 0.05~10.0 Hz
M-Val 2 Turn Effect on/off
47 3DManual M-Val 1° Azimuth 180/L168~0~R168
M-Val 2 Level 0~127
48 Lo-Fi 1 M-Val 1° Balance D>0E~D0M-Val 2 Pan L63 ~0~ R63
49 Lo-Fi 2 M-Val 1° R.Detune 0~127
M-Val 2 Balance D>0E~D050 OD→ Chors M-Val 1 OD Pan L63 ~0~ R63
M-Val 2° ChoBalance D>0E~D051 OD→ Flger M-Val 1 OD Pan L63 ~0~ R63
M-Val 2° FLBalance D>0E~D052 OD→ Delay M-Val 1 OD Pan L63 ~0~ R63
M-Val 2° DlyBalance D>0E~D053 DS→ Chors M-Val 1 DS Pan L63 ~0~ R63
M-Val 2° ChoBalance D>0E~D054 DS→ Flger M-Val 1 DS Pan L63 ~0~ R63
M-Val 2° FLBalance D>0E~D055 DS→ Delay M-Val 1 DS Pan L63 ~0~ R63
M-Val 2° DlyBalance D>0E~D056 EH→ Chors M-Val 1 EH Sens 0~127
M-Val 2° ChoBalance D>0E~D057 EH→ Flger M-Val 1 EH Sens 0~127
M-Val 2° FLBalance D>0E~D058 EH→ Delay M-Val 1 EH Sens 0~127
M-Val 2° DlyBalance D>0E~D059 Cho→ Dly M-Val 1 ChoBalance D>0E~D0M-Val 2° DlyBalance D>0E~D060 FL→ Delay M-Val 1 FL Fb –98% ~+98%
M-Val 2° DlyBalance D>0E~D061 Cho→ Flgr M-Val 1° ChoBalance D>0E~D0M-Val 2 FLBalance D>0E~D062 RotarMlt M-Val 1° OD Drive 0~127
*M-Val 2 RT Speed Slow/Fast
63 GTRMlt1A
(OD Amp Small)
M-Val 1° OD Drive 0~127
M-Val 2 Dly Mix 0~127
64 GTRMlt1B
(OD Amp BltIn)
M-Val 1° OD Drive 0~127
M-Val 2 Dly Mix 0~127
65 GTRMlt1C
(OD Amp 2-Stk)
M-Val 1° OD Drive 0~127
M-Val 2 Dly Mix 0~127
66 GTRMlt1D
(OD Amp 3-Stk)
M-Val 1° OD Drive 0~127
M-Val 2 Dly Mix 0~127
67 GTRMlt2A
(OD Amp Small)
M-Val 1 OD Drive 0~127
M-Val 2° CF Mix 0~127
68 GTRMlt2B
(OD Amp BltIn)
M-Val 1 OD Drive 0~127
M-Val 2° CF Mix 0~127
69 GTRMlt2C
(OD Amp 2-Stk)
M-Val 1 OD Drive 0~127
M-Val 2° CF Mix 0~127
70 GTRMlt2D
(OD Amp 3-Stk)
M-Val 1 OD Drive 0~127
M-Val 2° CF Mix 0~127
71 GTRMlt3A
(OD Amp Small)
M-Val 1° Wah Man 0~127
M-Val 2 OD Drive 0~127
72 GTRMlt3B
(OD Amp BltIn)
M-Val 1° Wah Man 0~127
M-Val 2 OD Drive 0~127
73 GTRMlt3C
(OD Amp 2-Stk)
M-Val 1° Wah Man 0~127
M-Val 2 OD Drive 0~127
74 GTRMlt3D
(OD Amp 3-Stk)
M-Val 1° Wah Man 0~127
M-Val 2 OD Drive 0~127
75 ClGtMlt1 M-Val 1° CF Mix 0~127
M-Val 2 Dly Mix 0~127
76 ClGtMlt2
Dly Time value 60m
M-Val 1° AW Man 0~127
M-Val 2 Dly Mix 0~127
77 BassMlti M-Val 1° OD Drive 0~127
M-Val 2 CF Mix 0~127
78 RhodMlt1
(Pan)
M-Val 1 TP ModRT 0.05~6.40 Hz
M-Val 2° TP ModDep 0~127
79 RhodMlt2
(Tremolo)
M-Val 1 TP ModRT 0.05~6.40 Hz
M-Val 2° TP ModDep 0~127
80 KeybMlti
(Tremolo)
M-Val 1 RM ModFrq 0~127
M-Val 2 RMBalance D>0E~D081 Cho/Dly M-Val 1 ChoBalance D>0E~D0M-Val 2° DlyBalance D>0E~D082 FL/Delay M-Val 1 FLBalance D>0E~D0M-Val 2° DlyBalance D>0E~D083 Cho/Flgr M-Val 1 ChoBalance D>0E~D0M-Val 2° FLBalance D>0E~D084 OD1/OD2 M-Val 1 OD1 Drive 0~127
M-Val 2° OD2 Drive 0~127
85 OD/Rotar M-Val 1 OD Drive 0~127
*M-Val 2° RTRT Speed Slow/Fast
86 OD/Phase M-Val 1 OD Drive 0~127
M-Val 2° PH Rate 0.05~10.0 Hz
87 OD/AtWah
(Overdrive + Auto Wah)
M-Val 1 OD Drive 0~127
M-Val 2° AW Man 0~127
88 PH/Rotar M-Val 1 PH Rate 0.05~10.0 Hz
*M-Val 2° RT Speed Slow/Fast
89 PH/AtWah M-Val 1 PH Rate 0.05~10.0 Hz
M-Val 2° AW Man 0~127