working python connection, though too much data right now, too slow connection

mpcArduino.ino

@@ -67,12 +67,18 @@ void setup()   {
   delay(500);
   layout(tick);
   calcMaxTicks();
+  
+  while(!Serial);
 }
 
 void loop() {
-    // print the string when a newline arrives:
+  // print the string when a newline arrives:
   if (stringComplete) {
       setFromSerial( inputString );
+      
+      // clear the string:
+      inputString = "";
+      stringComplete = false;
   }
   layout(tick++);
   if ( tick > maxticks ) tick = 0;

serial.ino

@@ -25,21 +25,27 @@ void setFromSerial (String inputString) {
     switch ( inputString.charAt(0) ) {
       case 'V':
           volume = inputString.substring(1).toInt();
+          Serial.println("Setting volume to " + String(volume));
           break;
       case 'T':
           title = inputString.substring(1);
+          Serial.println("Setting title to " + String(title));
           break;
       case 'A':
           artist = inputString.substring(1);
+          Serial.println("Setting artist to " + String(artist));
           break;
       case 'a':
           album = inputString.substring(1);
+          Serial.println("Setting album to " + String(album));
           break;
       case 'r':
           repeat = inputString.substring(1) != 0;
+          Serial.println("Setting repeat to " + String(repeat));
           break;
       case 'z':
           shuffle = inputString.substring(1) != 0;
+          Serial.println("Setting shuffle to " + String(shuffle));
           break;
        default:
          Serial.println(F("!Invalid line:"));
@@ -48,7 +54,4 @@ void setFromSerial (String inputString) {
          break;
     }
     calcMaxTicks();
-    // clear the string:
-    inputString = "";
-    stringComplete = false;
 }

ttycontrol.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+tty = '/dev/ttyACM1'
+baud = 9600
+
+import serial
+import time
+
+ser = serial.Serial(tty, baud)
+
+# Setup
+print("Setup")
+print(ser)
+print("------")
+
+ser.write("!Booya\n")
+ser.readline()
+
+# Final Loop
+volume = 0
+title = "Blub"
+artist = "ee"
+album = "dd"
+repeat = True
+shuffle = True
+
+
+def output(string):
+    ser.write(string+"\n")
+    time.sleep(0.4)
+
+def check_serial():
+    if (ser.inWaiting()>0): #if incoming bytes are waiting to be read from the serial input buffer
+        data_str = ser.read(ser.inWaiting()).decode('ascii') #read the bytes and convert from binary array to ASCII
+        print(data_str)
+while True:
+    volume = (volume + 1)
+    output("V" + str(volume))
+    output("T" + title)
+    output("A" + artist)
+    output("a" + album)
+    output("r" + str(repeat))
+    output("z" + str(shuffle))
+    print("--- output ---")
+    check_serial()
+    print("--- output ---")