以下に加えて1回路2接点のトグルスイッチを取り付ける(例えば左に倒すとCC21、右に倒すとCC22)には、どう書けばいいんでしょうか?

#include "MIDIUSB.h"
#define N_POTS 2

const uint8_t MIDICC = 0x0B;

const int potPin[] = {0, 1, 2};
const uint8_t potCN[] = {0x0A, 0x0B};

uint8_t potValues[N_POTS];
uint8_t potValuePrev[] = {0, 0};

void setup() {
}

void loop() {
readPots();
sendMIDI();
}

void readPots() {
for (int i=0; i < N_POTS; i++) {
int val = analogRead(potPin[i]);
potValues[i] = (uint8_t) (map(val, 0, 1023, 0, 127));
}
}

void controlChange(byte channel, byte control, byte value) {
midiEventPacket_t event = {0x0B, 0xB0 | channel, control, value};
MidiUSB.sendMIDI(event);
}

void sendMIDI()
{
for (int i=0; i < N_POTS; i++) {
if (abs(potValuePrev[i] - potValues[i]) > 1)
{
potValuePrev[i] = potValues[i];
controlChange(0, potCN[i], potValues[i]);
}
}
}