diff --git a/DCCTimer.h b/DCCTimer.h
index 7a9d940..7402f16 100644
--- a/DCCTimer.h
+++ b/DCCTimer.h
@@ -105,9 +105,14 @@ private:
 // that an offset can be initialized.
 class ADCee {
 public:
-  // init does add the pin to the list of scanned pins (if this
+  // begin is called for any setup that must be done before
+  // **init** can be called. On some architectures this involves ADC
+  // initialisation and clock routing, sampling times etc.
+  static void begin();
+  // init adds the pin to the list of scanned pins (if this
   // platform's implementation scans pins) and returns the first
-  // read value. It is called before the regular scan is started.
+  // read value (which is why it required begin to have been called first!)
+  // It must be called before the regular scan is started.
   static int init(uint8_t pin);
   // read does read the pin value from the scanned cache or directly
   // if this is a platform that does not scan. fromISR is a hint if
@@ -116,19 +121,15 @@ public:
   static int read(uint8_t pin, bool fromISR=false);
   // returns possible max value that the ADC can return
   static int16_t ADCmax();
-  // begin is called for any setup that must be done before
-  // scan can be called.
-  static void begin();
 private:
   // On platforms that scan, it is called from waveform ISR
   // only on a regular basis.
   static void scan();
   // bit array of used pins (max 16)
   static uint16_t usedpins;
+  static uint8_t highestPin;
   // cached analog values (malloc:ed to actual number of ADC channels)
   static int *analogvals;
-  // ids to scan (new way)
-  static byte *idarr;
   // friend so that we can call scan() and begin()
   friend class DCCWaveform;
   };
diff --git a/DCCTimerAVR.cpp b/DCCTimerAVR.cpp
index 40ce0fb..80cd245 100644
--- a/DCCTimerAVR.cpp
+++ b/DCCTimerAVR.cpp
@@ -1,6 +1,6 @@
 /*
  *  © 2021 Mike S
- *  © 2021-2022 Harald Barth
+ *  © 2021-2023 Harald Barth
  *  © 2021 Fred Decker
  *  © 2021 Chris Harlow
  *  © 2021 David Cutting
@@ -29,6 +29,9 @@
 #include <avr/boot.h> 
 #include <avr/wdt.h>
 #include "DCCTimer.h"
+#ifdef DEBUG_ADC
+#include "TrackManager.h"
+#endif
 INTERRUPT_CALLBACK interruptHandler=0;
 
   // Arduino nano, uno, mega etc
@@ -128,8 +131,8 @@ void DCCTimer::reset() {
 #define NUM_ADC_INPUTS 8
 #endif
 uint16_t ADCee::usedpins = 0;
+uint8_t ADCee::highestPin = 0;
 int * ADCee::analogvals = NULL;
-byte *ADCee::idarr = NULL;
 static bool ADCusesHighPort = false;
 
 /*
@@ -139,28 +142,17 @@ static bool ADCusesHighPort = false;
  */
 int ADCee::init(uint8_t pin) {
   uint8_t id = pin - A0;
-  byte n;
   if (id >= NUM_ADC_INPUTS)
     return -1023;
   if (id > 7)
     ADCusesHighPort = true;
   pinMode(pin, INPUT);
   int value = analogRead(pin);
-  if (analogvals == NULL) {
+  if (analogvals == NULL)
     analogvals = (int *)calloc(NUM_ADC_INPUTS, sizeof(int));
-    for (n=0 ; n < NUM_ADC_INPUTS; n++) // set unreasonable value at startup as marker
-      analogvals[n] = -32768;           // 16 bit int min value
-    idarr = (byte *)calloc(NUM_ADC_INPUTS+1, sizeof(byte));  // +1 for terminator value
-    for (n=0 ; n <= NUM_ADC_INPUTS; n++)
-      idarr[n] = 255;                   // set 255 as end of array marker
-  }
-  analogvals[id] = value; // store before enable by idarr[n]
-  for (n=0 ; n <= NUM_ADC_INPUTS; n++) {
-    if (idarr[n] == 255) {
-      idarr[n] = id;
-      break;
-    }
-  }
+  analogvals[id] = value;
+  usedpins |= (1<<id);
+  if (id > highestPin) highestPin = id;
   return value;
 }
 int16_t ADCee::ADCmax() {
@@ -170,14 +162,14 @@ int16_t ADCee::ADCmax() {
  * Read function ADCee::read(pin) to get value instead of analogRead(pin)
  */
 int ADCee::read(uint8_t pin, bool fromISR) {
-  (void)fromISR; // AVR does ignore this arg
   uint8_t id = pin - A0;
-  int a;
+  if ((usedpins & (1<<id) ) == 0)
+    return -1023;
   // we do not need to check (analogvals == NULL)
   // because usedpins would still be 0 in that case
-  noInterrupts();
-  a = analogvals[id];
-  interrupts();
+  if (!fromISR) noInterrupts();
+  int a = analogvals[id];
+  if (!fromISR) interrupts();
   return a;
 }
 /*
@@ -186,7 +178,8 @@ int ADCee::read(uint8_t pin, bool fromISR) {
 #pragma GCC push_options
 #pragma GCC optimize ("-O3")
 void ADCee::scan() {
-  static byte num = 0;       // index into id array
+  static byte id = 0;       // id and mask are the same thing but it is faster to
+  static uint16_t mask = 1; // increment and shift instead to calculate mask from id
   static bool waiting = false;
 
   if (waiting) {
@@ -198,26 +191,49 @@ void ADCee::scan() {
     low = ADCL; //must read low before high
     high = ADCH;
     bitSet(ADCSRA, ADIF);
-    analogvals[idarr[num]] = (high << 8) | low;
+    analogvals[id] = (high << 8) | low;
+    // advance at least one track
+#ifdef DEBUG_ADC
+    if (id == 1) TrackManager::track[1]->setBrake(0);
+#endif
     waiting = false;
+    id++;
+    mask = mask << 1;
+    if (id > highestPin) { // the 1 has been shifted out
+      id = 0;
+      mask = 1;
+    }
   }
   if (!waiting) {
-    // cycle around in-use analogue pins
-    num++;
-    if (idarr[num] == 255)
-      num = 0;
-    // start new ADC aquire on id
+    if (usedpins == 0) // otherwise we would loop forever
+      return;
+    // look for a valid track to sample or until we are around
+    while (true) {
+      if (mask  & usedpins) {
+	// start new ADC aquire on id
 #if defined(ADCSRB) && defined(MUX5)
-    if (ADCusesHighPort) {     // if we ever have started to use high pins)
-      if (idarr[num] > 7)              // if we use a high ADC pin
-	bitSet(ADCSRB, MUX5);  // set MUX5 bit
-      else
-	bitClear(ADCSRB, MUX5);
-    }
+	if (ADCusesHighPort) { // if we ever have started to use high pins)
+	  if (id > 7)          // if we use a high ADC pin
+	    bitSet(ADCSRB, MUX5); // set MUX5 bit
+	  else
+	    bitClear(ADCSRB, MUX5);
+	}
 #endif
-    ADMUX = (1 << REFS0) | (idarr[num] & 0x07); // select AVCC as reference and set MUX
-    bitSet(ADCSRA, ADSC);               // start conversion
-    waiting = true;
+	ADMUX=(1<<REFS0)|(id & 0x07); //select AVCC as reference and set MUX
+	bitSet(ADCSRA,ADSC); // start conversion
+#ifdef DEBUG_ADC
+	if (id == 1) TrackManager::track[1]->setBrake(1);
+#endif
+	waiting = true;
+	return;
+      }
+      id++;
+      mask = mask << 1;
+      if (id > highestPin) {
+	id = 0;
+	mask = 1;
+      }
+    }
   }
 }
 #pragma GCC pop_options
@@ -231,4 +247,4 @@ void ADCee::begin() {
   //bitSet(ADCSRA, ADSC); //do not start the ADC yet. Done when we have set the MUX
   interrupts();
 }
-#endif
\ No newline at end of file
+#endif
diff --git a/version.h b/version.h
index c3d47d9..6355f6b 100644
--- a/version.h
+++ b/version.h
@@ -4,7 +4,8 @@
 #include "StringFormatter.h"
 
 
-#define VERSION "4.2.54"
+#define VERSION "4.2.55"
+// 4.2.55 - Optimize analog read for AVR
 // 4.2.54 - EX8874 shield in config.example.h
 //        - Fix: Better warnings for pin number errors
 //        - Fix: Default roster list possible in Withrottle and <jR>