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diff --git a/PolyDrums_v0_1_5_DelayNoLPF/ADSRslow.h b/PolyDrums_v0_1_5_DelayNoLPF/ADSRslow.h
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+/*
+ * ADSRslow.h
+ *
+ * Copyright 2012 Tim Barrass.
+ * - tiny modification by Dave Green in setPhase for calling at Control Rate
+ 
+ * This file is part of Mozzi.
+ *
+ * Mozzi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Mozzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mozzi.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ADSR_H_
+#define ADSR_H_
+
+#include "Arduino.h"
+//#include <util/atomic.h>
+#include "Line.h"
+#include "mozzi_fixmath.h"
+
+/** A simple ADSR envelope generator.
+@todo Test whether using the template parameter makes any difference to speed, 
+and rationalise which units which do and don't need them.  
+Template objects are messy when you try to use pointers to them, 
+you have to include the whole template shebang in the pointer handling.
+*/
+template <unsigned int CONTROL_UPDATE_RATE>
+class ADSR
+{
+private:
+
+	const unsigned int AUDIO_TICKS_PER_CONTROL;
+
+	unsigned int phase_control_step_counter;
+	unsigned int phase_num_control_steps;
+
+	enum {ATTACK,DECAY,SUSTAIN,RELEASE,IDLE};
+	
+	
+	struct phase{
+		byte phase_type;
+		unsigned int control_steps;
+		unsigned long audio_steps;
+		Q8n0 level;
+	}attack,decay,sustain,release,idle;
+	
+	phase * current_phase;
+	
+	// Linear audio rate transitions for envelope
+	Line <unsigned long> transition;
+
+	inline
+	unsigned int convertMsecToControlSteps(unsigned int msec){
+		return (uint) (((ulong)msec*CONTROL_UPDATE_RATE)>>10); // approximate /1000 with shift
+	}
+
+	inline
+	void setPhase(phase * next_phase) {
+		phase_control_step_counter = 0;
+		phase_num_control_steps = next_phase->control_steps;
+		transition.set(Q8n0_to_Q16n16(next_phase->level),next_phase-> control_steps);
+// Dave G: divide by control_steps rather than audio_steps to call at Control Rate instead!
+		current_phase = next_phase;
+	}
+	
+	
+	
+	inline
+	void checkForAndSetNextPhase(phase * next_phase) {
+		if (++phase_control_step_counter >= phase_num_control_steps){
+			setPhase(next_phase);
+		}
+	}
+				
+	
+	inline
+	void checkForAndSetIdle() {
+		if (++phase_control_step_counter >= phase_num_control_steps){
+			transition.set(0,0,1);
+			current_phase = &idle;
+		}
+	}
+	
+	
+	
+inline
+	void setTime(phase * p, unsigned int msec)
+	{
+		p->control_steps=convertMsecToControlSteps(msec);
+		p->audio_steps = (ulong) p->control_steps * AUDIO_TICKS_PER_CONTROL;
+	}
+	
+	
+public:
+
+	/** Constructor.
+	 */
+	ADSR():AUDIO_TICKS_PER_CONTROL(AUDIO_RATE/CONTROL_UPDATE_RATE)
+	{
+		attack.phase_type = ATTACK;
+		decay.phase_type = DECAY;
+		sustain.phase_type = SUSTAIN;
+		release.phase_type = RELEASE;
+		idle.phase_type = IDLE;
+		release.level = 0;
+	}
+
+
+/** Updates the internal controls of the ADSR.
+	Call this in updateControl().
+	*/
+	void update(){ // control rate
+		
+		switch(current_phase->phase_type) {
+			
+			case ATTACK:
+				checkForAndSetNextPhase(&decay);
+				break;
+
+			case DECAY:
+					checkForAndSetNextPhase(&sustain);
+				break;
+					
+			case SUSTAIN:
+					checkForAndSetNextPhase(&release);										
+				break;
+					
+			case RELEASE:
+					checkForAndSetIdle();							
+				break;
+
+		}	
+	}
+
+	/** Advances one audio step along the ADSR and returns the level.
+	Call this in updateAudio().
+	@return the next value, as an unsigned int.
+	 */
+	inline
+	unsigned int next()
+	{
+		return Q16n16_to_Q16n0(transition.next());
+	}
+
+
+
+	/** Start the attack phase of the ADSR.  THis will restart the ADSR no matter what phase it is up to.
+	*/
+	inline
+	void noteOn(){
+		setPhase(&attack);
+	}
+
+
+
+	/** Start the release phase of the ADSR.
+	@todo fix release for rate rather than steps (time), so it releases at the same rate whatever the current level.
+	*/
+	inline
+	void noteOff(){   		
+		setPhase(&release);
+	}
+
+
+
+
+
+	/** Set the attack level of the ADSR.
+	@param value the attack level.
+	 */
+	inline
+	void setAttackLevel(byte value)
+	{
+		attack.level=value;
+	}
+
+
+
+	/** Set the decay level of the ADSR.
+	@param value the decay level.
+	*/
+	inline
+	void setDecayLevel(byte value)
+	{
+		decay.level=value;
+	}
+
+
+	/** Set the sustain level of the ADSR.
+	@param value the sustain level.  Usually the same as the decay level, 
+	for a steady sustained note.
+	*/
+	inline
+	void setSustainLevel(byte value)
+	{
+		sustain.level=value;
+	}
+	
+	/** Set the release level of the ADSR.  Normally you'd make this 0, 
+	but you have the option of some other value.
+	@param value the release level (normally 0).
+	*/
+	inline
+	void setReleaseLevel(byte value)
+	{
+		release.level=value;
+	}
+	
+	
+	
+	/** Set the attack and decay levels of the ADSR.  This assumes a conventional 
+	ADSR where the sustain continues at the same level as the decay, till the release ramps to 0.
+	@param attack the new attack level.
+	@param value the new sustain level.
+	*/
+	inline
+	void setADLevels(byte attack, byte decay)
+	{
+		setAttackLevel(attack);
+		setDecayLevel(decay);
+		setSustainLevel(decay);
+		setReleaseLevel(0);
+	}
+	
+
+
+	
+	
+	
+	
+	/** Set the attack time of the ADSR in milliseconds.
+	The actual time taken will be resolved within the resolution of CONTROL_RATE.
+	@param value the unsigned int attack time in milliseconds.
+	 */
+	inline
+	void setAttackTime(unsigned int msec)
+	{
+		setTime(&attack, msec);
+	}
+
+
+	/** Set the decay time of the ADSR in milliseconds.
+	The actual time taken will be resolved within the resolution of CONTROL_RATE.
+	@param value the unsigned int decay time in milliseconds.
+	*/
+	inline
+	void setDecayTime(unsigned int msec)
+	{
+		setTime(&decay, msec);
+	}
+
+	
+	/** Set the sustain time of the ADSR in milliseconds.
+	The actual time taken will be resolved within the resolution of CONTROL_RATE.
+	The sustain phase will finish if the ADSR recieves a noteOff().
+	@param value the unsigned int sustain time in milliseconds.
+	*/
+	inline
+	void setSustainTime(unsigned int msec)
+	{
+		setTime(&sustain, msec);
+	}
+	
+	
+
+	/** Set the release time of the ADSR in milliseconds.
+	The actual time taken will be resolved within the resolution of CONTROL_RATE.
+	@param value the unsigned int release time in milliseconds.
+	*/
+	inline
+	void setReleaseTime(unsigned int msec)
+	{
+		setTime(&release, msec);
+	}
+	
+
+
+	/** Set the attack, decay and release times of the ADSR in milliseconds.
+	The actual times will be resolved within the resolution of CONTROL_RATE.
+	@param attack_ms the new attack time in milliseconds.
+	@param decay_ms the new decay time in milliseconds.
+	@param decay_ms the new sustain time in milliseconds.
+	@param release_ms the new release time in milliseconds.
+	*/
+	inline
+	void setTimes(unsigned int attack_ms, unsigned int decay_ms, unsigned int sustain_ms, unsigned int release_ms)
+	{
+		setAttackTime(attack_ms);
+		setDecayTime(decay_ms);
+		setSustainTime(sustain_ms);
+		setReleaseTime(release_ms);
+	}
+
+
+};
+
+#endif /* ADSR_H_ */
+