Serial communication with MCP4725 DAC's with Arduino/Max 6

Hello.

I am trying to use an Arduino board to monitor the voltage of two MCP 4725 DAC's with different values.

I input the value through a Max patcher (Max 6, from https://docs.cycling74.com/max5/tutorials/max-tut/communicationschapter02.html) and transmit it to the Arduino board.Then it translates the 0-255 we enter in Max into DAC values for the setvoltage(value) method (0-4095).

My first issue is that i can't assign a value in my loop. We could simply do (0 to 255) * 16,06 = (0 to 4095) obviously but i had to do that huge ugly switch case.

The second one is that i can't find a way to store 2 different values from Max.

Here is my code if it helps :

void loop(void) {

unsigned long currentMillis = millis();

if(Serial.available()) // check to see if there's serial data in the buffer
{ serialvalue = Serial.read(); // read a byte of serial data
} if(currentMillis - previousMillis > interval) { switch(serialvalue){ case 255: dac1.setVoltage(4095,false); dac2.setVoltage(4095,false); break; ... etc.

Our final idea is to be able to monitor 4 DAC's with Max at different voltages. I've beeen trying to go throng Serial.read() and Serial.readBytes() functions without success.

Thanks for your help.