diff --git a/granulator.scd b/granulator.scd
index fac91ac..3763f76 100644
--- a/granulator.scd
+++ b/granulator.scd
@@ -4,9 +4,7 @@
 ~modes = [
 	[ "saw", \pos_saw ],
 	[ "reverse", \pos_reverse ],
-	[ "sine", \pos_sine ],
-	[ "step", \pos_step ],
-	[ "random", \pos_random ]
+	[ "sine", \pos_sine ]
 ];
 
 ~outputDir = Platform.recordingsDir +/+ "GrainBuffers";
@@ -15,15 +13,16 @@
 ~grainsb = Bus.audio(s, 2);
 
 ~granulators = Array.new(4);
+~grainmodes = [ 0, 0, 0, 0 ]; // keep track of mode so don't swap if not needed
 ~posb = Array.new(4);
 ~rectriggerb = Array.new(4);
-~possynths = Array.new(4);
-~triggersynths = Array.new(4);
+~patterns = Array.new(4);
+~players = Array.new(4);
+~loopsynths = Array.new(4);
 
 // create the control busses
 
 (0..3).do({
-	var ps;
 	~posb.add(Bus.control(s, 1));
 	~rectriggerb.add(Bus.control(s, 1));
 });
@@ -35,29 +34,49 @@
 	~granulators.add(Granulator.new(~buflen, ~infxb, ~grainsb, pb, rtb));
 });
 
-
-// launch the pos synths and triggers to sync the buffer recorders
+// set up the Patterns which drive the position synths
 
 (0..3).do({ |i|
-	var pb = ~posb[i], rtb = ~rectriggerb[i];
-	~possynths.add(Synth(\pos_saw, [ \out, pb, \speed, 1 / ~buflen ]));
-	~triggersynths.add(Synth(\trigger, [ \out, rtb, \freq, 1 / ~buflen ]));
+	~patterns.add(~makePattern.value(i, 0));
 });
 
-// TODO - retrigger the buffer records when changing the length etc
+// play the four patterns
+// to-do - will these need separate tempoclocks?
+
+(0..3).do({|i|
+	~players.add(~patterns[i].play(~tc, quant: ~beatsperbar))
+});
 
 ~setmode = {
 	arg track, mode;
-	var synth = ~modes[mode][1];
-	~possynths[track].get(\speed, { | speed |
-		~possynths[track].free;
-		~triggersynths[track].free;
-		~possynths[track] = Synth(synth, [\out, ~posb[track], \speed, speed]);
-		~triggersynths[track] = Synth(\trigger, [ \out, ~rectriggerb[track] ]);
+	if( ~grainmodes[track] != mode, {
+		~grainmodes[track] = mode;
+		~players[track].stop;
+		~patterns[track].free;
+		~patterns[track] = ~makePattern.value(track, mode);
+		~players[track] = ~patterns[track].play(~tc, quant: ~beatsperbar);
 	});
-	~granulators[track].mode_(mode);
 };
 
+~makePattern = {
+	arg track, mode;
+	var ptrig, ppos, synth = ~modes[mode][1];
+	[ "makePattern", ~track, ~buflen ].postln;
+	ptrig = Pbind(
+		\instrument, \trigger,
+		\dur, ~beatsperbar,
+		\out, ~rectriggerb[track]
+	);
+	ppos = Pbind(
+		\instrument, synth,
+		\dur, ~beatsperbar,
+		\length, ~buflen,
+		\out, ~posb[track]
+	);
+	Ppar([ptrig, ppos]);
+};
+
+
 ~dumpbuffers = { |prefix|
 	(0..3).do({|i|
 		var filename = ~outputDir +/+ prefix ++ 'buffer' ++ i.asString ++ '.aiff';
diff --git a/interface.scd b/interface.scd
index eb6bd3b..dba2364 100644
--- a/interface.scd
+++ b/interface.scd
@@ -85,10 +85,10 @@ OSCdef.freeAll;
 ~to.slider('/grains/buflen', ~buflen, TouchOSCScale(0.1, 10.0), {});
 
 
-// ~to.button('/grains/mode0', 0, { |v| ~granulators[0].mode_(v); ~setmode.value(0, v) });
-// ~to.button('/grains/mode1', 0, { |v| ~granulators[1].mode_(v); ~setmode.value(1, v) });
-// ~to.button('/grains/mode2', 0, { |v| ~granulators[2].mode_(v); ~setmode.value(2, v) });
-// ~to.button('/grains/mode3', 0, { |v| ~granulators[3].mode_(v); ~setmode.value(3, v) });
+~to.button('/grains/mode0', 0, { |v| ~setmode.value(0, v) });
+~to.button('/grains/mode1', 0, { |v| ~setmode.value(1, v) });
+~to.button('/grains/mode2', 0, { |v| ~setmode.value(2, v) });
+~to.button('/grains/mode3', 0, { |v| ~setmode.value(3, v) });
 //
 // ~to.slider('/grains/speed0', 1, TouchOSCScale(0, 2), { |v| ~setspeed.value(0, v) });
 // ~to.slider('/grains/speed1', 1, TouchOSCScale(0, 2), { |v| ~setspeed.value(1, v) });
diff --git a/main.scd b/main.scd
index ce9453e..d7cd723 100644
--- a/main.scd
+++ b/main.scd
@@ -32,24 +32,15 @@ Routine.run({
 	s.sync;
 	("./control.scd").loadRelative;
 	s.sync;
-
-});
-)
-
 	("./granulator.scd").loadRelative;
-
-
-(
-Routine.run({
+	s.sync;
 	("./effects.scd").loadRelative;
 	s.sync;
 	("./sequencer.scd").loadRelative;
 	s.sync;
+	~buflen.sleep;
+	"loading interface".postln;
 	("./interface.scd").loadRelative;
 });
 )
 
-~posb[0].scope
-~granulators[0].grainamp_(0);
-~granulators[0].loopsynth
-~dumpbuffers.value("looptober23")
\ No newline at end of file
diff --git a/sequencer.scd b/sequencer.scd
index ce93b85..da45d47 100644
--- a/sequencer.scd
+++ b/sequencer.scd
@@ -2,14 +2,6 @@
 (
 
 
-SynthDef(\metronome, {
-	arg out=0, amp=1, pan=0, filter=1000, atk=0.01, rel=0.1;
-	var sig, env;
-	env = EnvGen.kr(Env.perc(atk, rel, amp), doneAction: Done.freeSelf);
-	sig = HPF.ar(WhiteNoise.ar(), filter);
-	Out.ar(out, Pan2.ar(sig * env, pan));
-}
-).add;
 
 ~metrob = Bus.audio(s, 2);
 
@@ -21,7 +13,7 @@ SynthDef(\metronome, {
 
 ~metronome = Pbind(
 	\instrument, \metronome,
-	\dur, 1,
+	\dur, ~beatsperbar,
 	\amp, 0.5,
 	\pan, 0,
 	\out, ~metrob
diff --git a/synths.scd b/synths.scd
index 707bff5..7e04845 100644
--- a/synths.scd
+++ b/synths.scd
@@ -1,18 +1,18 @@
 (
 
 SynthDef(\pos_saw, {
-	arg out, dur=1;
-	Out.kr(out, EnvGen.kr(Env([0, 1], dur), doneAction: Done.freeSelf))
+	arg out, length=1;
+	Out.kr(out, EnvGen.kr(Env([0, 1], length), doneAction: Done.freeSelf))
 }).add();
 
-SynthDef(\pos_sin, {
-	arg out, dur=1;
-	Out.kr(out, EnvGen.kr(Env.sine(dur, 1), doneAction: Done.freeSelf))
+SynthDef(\pos_sine, {
+	arg out, length=1;
+	Out.kr(out, EnvGen.kr(Env.sine(length, 1), doneAction: Done.freeSelf))
 }).add();
 
 SynthDef(\pos_reverse, {
-	arg out, dur=1;
-	Out.kr(out, EnvGen.kr(Env([1, 0], dur), doneAction: Done.freeSelf))
+	arg out, length=1;
+	Out.kr(out, EnvGen.kr(Env([1, 0], length), doneAction: Done.freeSelf))
 }).add();
 
 // SynthDef(\pos_step, {
@@ -42,3 +42,4 @@ SynthDef(\metronome, {
 ).add;
 
 )
+