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+#ifndef UDO_TEMPOTOOLS
+#define UDO_TEMPOTOOLS ##
+/*
+	Tempo tools
+
+	This file is part of the SONICS UDO collection by Richard Knight 2021
+		License: GPL-2.0-or-later
+		http://1bpm.net
+*/
+
+/*
+	Get the beat time (1/4 note) and quarter beat time (1/16 note) in seconds
+		for a given BPM
+		
+	ibeattime, iquartertime tempotime ibpm
+	
+	ibeattime		the 1/4 note time in seconds
+	iquartertime	the 1/16 note time in seconds
+	ibpm			the beats per minute value
+*/
+opcode tempotime, ii, i
+	itempo xin
+	ibeattime = 60.0 / itempo
+	iquartertime = ibeattime * .25
+	xout ibeattime, iquartertime
+endop
+
+
+/*
+	Get the swung time (when iquarterindex is 1 or 3) for a given time
+	Using iquartertime as the 1/16 beat time and iswing as multiplier of
+		iquartertime to add to the time (iswing should be less than one)
+		
+	itime swinger iquarterindex, iquartertime, itime, iswing
+	
+	itime			the time with swing applied
+	iquarterindex	the quarter beat index MIN(0) MAX(3)
+	iquartertime	time of one 1/16th beat
+	itime			the normal/quantised time
+	iswing			the swing amount MIN(0) MAX(1)
+	
+*/
+opcode swinger, i, iiii
+	iquarterindex, iquartertime, itime, iswing xin
+	if (iquarterindex == 1 || iquarterindex == 3) then 
+		itime = itime + (iswing * iquartertime)
+	endif
+	xout itime
+endop
+
+
+/*
+	Metronome with random variation
+	
+	ktrigger drunkenmetro kfreq
+	
+	ktrigger	the metronome trigger
+	kfreq		metronome frequency in hz
+*/
+opcode drunkenmetro, k, k
+	kfreq xin
+	kbtime = 1.0 / kfreq
+	kmetro metro kfreq
+	kdeltime random 0, (1.0 / kfreq) * 0.9
+	kout vdel_k kmetro, kdeltime, 1
+	xout kout
+endop
+
+
+
+
+#end
+\ No newline at end of file