You can use a control change message (CC#83) to select the effects.
The effects (selectable effects) corresponding to the respective CC#83 values are shown below.
BUS1 (MIDI ch 1), BUS2 (MIDI ch 2)
Value of CC#83  |  
            Effect name  |  
           
|---|---|
0  |  
            (OFF)  |  
           
1  |  
            Direct FX1  |  
           
2  |  
            Direct FX2  |  
           
3  |  
            Direct FX3  |  
           
4  |  
            Direct FX4  |  
           
5  |  
            Direct FX5  |  
           
6  |  
            Scatter  |  
           
7  |  
            Downer  |  
           
8  |  
            Ha-Dou  |  
           
9  |  
            Ko-Da-Ma  |  
           
10  |  
            Zan-Zou  |  
           
11  |  
            To-Gu-Ro  |  
           
12  |  
            SBF  |  
           
13  |  
            Stopper  |  
           
14  |  
            Tape Echo  |  
           
15  |  
            TimeCtrlDly  |  
           
16  |  
            Super Filter  |  
           
17  |  
            WrmSaturator  |  
           
18  |  
            303 VinylSim  |  
           
19  |  
            404 VinylSim  |  
           
20  |  
            Cassette Sim  |  
           
21  |  
            Lo-fi  |  
           
22  |  
            Reverb  |  
           
23  |  
            Chorus  |  
           
24  |  
            JUNO Chorus  |  
           
25  |  
            Flanger  |  
           
26  |  
            Phaser  |  
           
27  |  
            Wah  |  
           
28  |  
            Slicer  |  
           
29  |  
            Tremolo/Pan  |  
           
30  |  
            Chromatic PS  |  
           
31  |  
            Hyper-Reso  |  
           
32  |  
            Ring Mod  |  
           
33  |  
            Crusher  |  
           
34  |  
            Overdrive  |  
           
35  |  
            Distortion  |  
           
36  |  
            Equalizer  |  
           
37  |  
            Compressor  |  
           
38  |  
            SX Reverb  |  
           
39  |  
            SX Delay  |  
           
40  |  
            Cloud Delay  |  
           
41  |  
            Back Spin  |  
           
42–127  |  
            –  |  
           
BUS3 (MIDI ch 3), BUS4 (MIDI ch 4)
Value of CC#83  |  
            Effect name  |  
           
|---|---|
0  |  
            (OFF) | 
1  |  
            303 VinylSim  |  
           
2  |  
            404 VinylSim  |  
           
3  |  
            Cassette Sim  |  
           
4  |  
            Lo-fi  |  
           
5  |  
            Downer  |  
           
6  |  
            Compressor  |  
           
7  |  
            Equalizer  |  
           
8  |  
            Isolator  |  
           
9  |  
            Super Filter  |  
           
10  |  
            Filter+Drive  |  
           
11  |  
            WrmSaturator  |  
           
12  |  
            Overdrive  |  
           
13  |  
            Distortion  |  
           
14  |  
            Crusher  |  
           
15  |  
            Ring Mod  |  
           
16  |  
            SBF  |  
           
17  |  
            Resonator  |  
           
18  |  
            Hyper-Reso  |  
           
19  |  
            Chromatic PS  |  
           
20  |  
            Reverb  |  
           
21  |  
            Ha-Dou  |  
           
22  |  
            Zan-Zou  |  
           
23  |  
            Sync Delay  |  
           
24  |  
            TimeCtrlDly  |  
           
25  |  
            Ko-Da-Ma  |  
           
26  |  
            Tape Echo  |  
           
27  |  
            Chorus  |  
           
28  |  
            JUNO Chorus  |  
           
29  |  
            Flanger  |  
           
30  |  
            Phaser  |  
           
31  |  
            Wah  |  
           
32  |  
            Slicer  |  
           
33  |  
            Tremolo/Pan  |  
           
34  |  
            To-Gu-Ro  |  
           
35  |  
            DJFX Looper  |  
           
36  |  
            Scatter  |  
           
37  |  
            SX Reverb  |  
           
38  |  
            SX Delay  |  
           
39  |  
            Cloud Delay  |  
           
40–127  |  
            –  |  
           
INPUT FX (MIDI ch 5)
Value of CC#83  |  
            Effect name  |  
           
|---|---|
0  |  
            (OFF) | 
1  |  
            Auto Pitch  |  
           
2  |  
            Vocoder  |  
           
3  |  
            Harmony  |  
           
4  |  
            Gt Amp Sim  |  
           
5  |  
            Chorus  |  
           
6  |  
            JUNO Chorus  |  
           
7  |  
            Reverb  |  
           
8  |  
            TimeCtrlDly  |  
           
9  |  
            Chromatic PS  |  
           
10  |  
            Downer  |  
           
11  |  
            WrmSaturator  |  
           
12  |  
            303 VinylSim  |  
           
13  |  
            404 VinylSim  |  
           
14  |  
            Cassette Sim  |  
           
15  |  
            Lo-fi  |  
           
16  |  
            Equalizer  |  
           
17  |  
            Compressor  |  
           
18–127  |  
            –  |