LiveBeats is a command-line based audio/visual live performance tool for browser. LiveBeats can generate various sounds and visual effects by commmands from keyboard. WebCam is required.

Chrome is recomemded.
Firefox may produce some abnormal sounds.
Edge can work but need so long initialization time.

Simple Tutorial:

Type	Description
cam.a=1	Set 'cam' object to visible
cam.v=.3	Sound from 'cam' object is enabled. You can hear the sound from 'cam' by making motion in front of WebCam.
cam.effpointer=2	'cam' object pointer is enabled.
cam.effmelt=lfo32*2	'cam' object melt effect
bdo.s=crrr	Set bass drum pattern to 'crrr'.
sdo.s=rrrrcrrr	Set snare drum pattern to 'rrrrcrrr'.
hho.s=cr	Set Hi-hat pattern to 'cr'.
o1.s=aarrrrrr	Set bass pattern.
o5.s=o1.s	Set osc5 pattern same as osc1
o5.f=55	Osc-5 base frequency to 55Hz
o5.out=o1	FM mode from osc-5 to osc-1
o2.s=ageeagdedeaa	Set Osc-2 pattern
o2.q=28	Set Osc-2 filter Q
o2.c=lfo32*32+1	Modify Osc-2 filter cutoff with LFO
o2.delay=.3	Set Osc-2 delay effect
o3.s=g	Set Osc-3 pattern
o3.f=Math.random()*1000+100	Make random Osc-3 frequency
wav.hue=lfo16	wav display color change
wav.rot=tick	wav display rotation
wav.line=beat8*100	Change wave display width with beat

Basics:

Everythings are controlled via commands from keyboard. For example, typing "o1.s=crrr" will set sequence 'crrr' to oscillator-1. Almost control commands take the assignment statement like 'object.property=formula'.

Each property is a 'number' or a 'string'. The 'number' property will be repeatedly evaluated until it has a number value. And the 'string' property will be repeatedly evaluated while the result is a string.

For example,
(osc-1 freq : number) o1.f=110 <-- '110' will be evaluated as a number
(osc-2 freq : number) o2.f=o1.f <-- 'o1.f' will be '110', and evaluated as a number
(osc-1 sequence : string) o1.s=abcde <-- 'abcde' will be evaluated as a string 'abcde'
(osc-2 sequence : string) o2.s=o1.s <-- 'o1.s' will evalueted as 'abcde'

formula can contain bultin variables,
tick --- count up per tick (sixteenth note)
lfo2 / lfo4 / lfo8 / lfo16 / lfo32 / lfo64 --- low frequency osillator (n-ticks cycle)
sh1 / sh2 / sh4 / sh8 / sh16 / sh32 / sh64 --- sample & hold value (changes every n-ticks)
beat4 / beat8 / beat16 / beat32 / beat64 --- trigger per n-ticks

For example,
o1.f=sh4*1000+100 --- random note using sample&hold
o1.c=lfo16*1000+100 --- filter sweep by lfo

object.property=formula	Assign formula to object's property. Each formula will be evaluated per each step and reflected to sound/image result (there are some exception).
list [object name]	list available objects or object's properties.
list midi	list available MIDI ports, that can be used to specify 'cam.midi'.
list ir	list available Impulse Response files, that can be used to specify 'master.ir'.
list plugins	list available visualizer plugins.
print <formula>	evaluate the formula and print

o1,o2,...o8		Oscillators, including filter, volume and panning control. o1 and o5 are assumed to bassline. Following description is o1.x but others are same as o1.
o1.s	string	Secquence for this osillator with MML-style string. Basically, this string is consist of chars 'rcdefgab', that means 'rest' or note name. Each char is assinged to one-step. Default value="r"
o1.g	string	Gate control for this oscillator with MML-style string. This is consist of chars 'rcdefgab'. r=mute, c=max volume and d,e,f,g... will decrease volume.
o1.v	number	Volume control
o1.f	number	Base frequency for note 'a'. default value is 110 for o1 and o5. otherwise 440.
o1.c	number	Filter cutoff. Specifying multiple number of current osc frequency.
o1.q	number	Filter Q-factor.
o1.d	number	Decay time.
o1.porta	number	Portamento time.
o1.delay	number	Send to delay object (0.0 - 1.0)
o1.wav	string	Custom waveform coeff string
o1.type	number	Wave form (0:sine 1:sawtooth 2:square 3:custom)
o1.pan	number	Panning control. (0(left) <-> 0.5(center) <-> 1.0(right))
o1.out	object	Specify the output rourting. default='master'. FM modulation will be configured if you specify other oscillator like o1,o2,...

bdo,sdo,hho,cyo		percussive sound oscillators. specialized to bdo:bass-drum, sdo:snare-drum, hho:hihat, cyo:cymbal. Following description is bdo.x but others are same as bdo.
bdo.s	string	Secquence for this osicllator with MML-style string. This string is consist of chars 'rcdefgab', that means 'rest' or note name. Each char is assinged to one-step. Default value="r"
bdo.v	number	Volume control
bdo.pan	number	Panning control. (0(left) <-> 0.5(center) <-> 1.0(right))

delay		Delay effects. This object receive sounds from 'cam' and 'o1'-'o8' and add feedback delay effect.
delay.t	number	Delay time control. delay time is tempo synced. default=8 (8th note)
delay.fb	number	Delay feedback ratio

say		Speech object. This object use SpeechSynthesis API.
say.t	string	Specify text to speak. it can be sync to beat if comma separated
say.v	number	speech volume
say.p	number	speech pitch
say.r	number	speech rate

master		master control
master.v	number	master volume. default value is 1.0
master.tempo	number	tempo control. default value=120
master.g	string	master step effect control. Each char is assigned to overall effect of one-step. available chars are "0123456789", each number has each type of effect. "0" is no effect.
master.rev	number	Reverb level. 'master.ir' should abe set
master.ir	number	Select Impulse Response file for reverb effect. Available values are listed by 'list ir' command.

Visualizer effects are modules that visualize output sounds. Visualizers are implemented as plugin modules. Currentry, 'vj_wave' and 'vj_matrix' are available and defaultly be loaded. Plugin codes is just a JavaScript function that create a dom-element and draw. 'vj_simplewave.js' is a simple sample code. If you make your own plugin, that can be loaded by drop to LiveBeats.

Detail spec is here : vjpluginspec.html

Followings are default loaded visualizers. Especially txt plugin and cam plugin has special functions not only for visual effects.

txt plugin is a command-line display plugin. this plugin displays the texts from keyboard input and always placed on top of other plugins.

txt		Command inputs.
txt.a	number	alpha value of txt object (0.0 - 1.0)
txt.w	number	width of txt object (0.0 - 1.0)
txt.h	number	height of txt object (0,0 - 1.0)
txt.x	number	x pos of txt object. (0:far left - 0.5:center - 1.0:far right)
txt.y	number	y pos of txt object. (0:top - 0.5:center - 1.0:bottom)
txt.z	number	zoom factor of txt object. fit to window size if 1.0
txt.rot	number	rotation of txt object in degree.
txt.col	string	text color. e.g. '#fff'. hue(value) function is also available.

cam plugin displays image from WebCam, detect mootions, and output audio/MIDI signals.

cam		Dipslay WebCam image and generate sound from motion detect.
cam.a	number	alpha value of cam image (0.0 - 1.0)
cam.w	number	width of cam image (0.0 - 1.0)
cam.h	number	height of cam image (0.0 - 1.0)
cam.x	number	x pos of cam image. (0:far left - 0.5:center - 1.0:far right)
cam.y	number	y pos of cam image. (0:top - 0.5:center - 1.0:bottom)
cam.z	number	zoom factor of cam image. fit to window size if 1.0
cam.rot	number	rotation of cam image in degree.
cam.effhue	number	hue rotation of cam image in degree.
cam.effpointer	number	motion pointer type. 0:none, 1:star, 2:line
cam.effposter	number	posterize.
cam.effmotion	number	motion effect. 0:none, 1:motion to red, 2:motion to white, 3:motion to fire effect
cam.effscan	number	scanline effect.
cam.effkaleido	number	kaleidscope effect. 0:none, 1:dual, 2:quad, 3:octa
cam.scale	string	Specify scale of cam sound with MML-style string. In default, 2 octave pentatonic scale, 'cdega>cdega>c'
cam.midi	number	Use MIDI message instead of built-in oscillator sound. 0:build-in oscillator(Non-MIDI), otherwise specify midi port number that is listed in 'list midi' command. Note that the Web MIDI API should be available. defalut=0.
cam.v	number	Sound volume
cam.delay	number	Sound send level to delay object

'wav' module displays waveform or spectrums.

wav		Wave form display.
wav.a	number	alpha value of wav image (0.0 - 1.0)
wav.w	number	width of wav image (0.0 - 1.0)
wav.h	number	height of wav image (0,0 - 1.0)
wav.x	number	x pos of wav image. (0:far left - 0.5:center - 1.0:far right)
wav.y	number	y pos of wav image. (0:top - 0.5:center - 1.0:bottom)
wav.z	number	zoom factor of wav image. fit to window size if 1.0
wav.blur	number	whole blur effect.
wav.rot	number	rotation of wav image in degree.
wav.effb	number	blur effect around lines. .bcol will be used. default=0
wav.effx	number	x-offset effect. default=0
wav.effy	number	y-offset effect. default=0
wav.effz	number	zoom effect. default=1
wav.effr	number	erase rate effect
wav.fill	number	fill mode. 0:line 1:fill
	wav.line	number	stroke line width
wav.type	number	0:waveForm 1:spectrum 2:circle
wav.col	string	wav form color. e.g. '#fff'. hue(value),hsv(h,s,v) function is also available.
wav.bcol	string	wav blur color. e.g. '#fff'. hue(value),hsv(h,s,v) function is also available.

'mat' module is charactor based 'matrix' like effect.

wav		Matrix effects.
mat.a	number	alpha value of mat object (0.0 - 1.0)
mat.w	number	width of mat object (0.0 - 1.0)
mat.h	number	height of mat object (0,0 - 1.0)
mat.x	number	x pos of mat object. (0:far left - 0.5:center - 1.0:far right)
mat.y	number	y pos of mat object. (0:top - 0.5:center - 1.0:bottom)
mat.z	number	zoom factor of mat object. fit to window size if 1.0
mat.blur	number	whole blur effects.
mat.rot	number	rotation of mat object in degree.
mat.effb	number	blur effect around chars. bcol will be used. default=0
mat.effx	number	x-offset effect. default=0
mat.effy	number	y-offset effect. default=0
mat.effz	number	zoom effect. default=1
mat.effr	number	erase rate effect
mat.fill	number	fill mode. 0:line 1:fill
mat.col	string	charactor color. e.g. '#fff'. hue(value),hsv(h,s,v) function is also available.
mat.bcol	string	blur color. e.g. '#fff'. hue(value),hsv(h,s,v) function is also available.

Variables:

Pre-defined variables can be used in formula.

tick	'tick' is a count-up value from start of LiveBeats. Always integer. For example, it can be used as a rotation, e.g. 'wav.rot=tick'
s0 - s24	preset sequence pattern. can be used to o1.s-o8.s (may be also for bdo.s-cyo.s)
sh8, sh16, sh32, sh64	shX are sample and hold random value. It will be changed to next random value per each X-tick step. value range is 0.0-1.0, for example, it can be used to 'wav.x=sh8'.
lfo8, lfo16, lfo32, lfo64	lfoX are low frequency oscillator (LFO) values. These are equivalent to the function 'lfo(X)'. These are X-tick periodic value in the range of (0.0-1.0). Wave form is triangle. For example, it can be used as 'o1.pan=lfo16'.

Functions:

Pre-defined functions can be used in formula.

lfo(value)	Low frequency oscillator (LFO) function. This function makes periodic oscillated value. The period is specified tick by 'value'. value range is (0.0 - 1.0).
hue(value)	'hue(value)' will convert number(0.0-1.0) to color string. This is equivalent to hsv(value,1,1). That can be used as 'wav.col' or 'txt.col'.
hsv(h,s,v)	'hsv(h,s,v)' will convert h:hue, s:saturation, v:brightness to color string. That can be used as 'wav.col', 'txt.col'.

MML-style string:

o1.s - o8.s, bdo.s, sdo.s, hho.s and cyo.s are described in MML-style string.

r	r[len]	Rest. default length is used if no len is specified.
c,d,e,f,g,a,b	<c|d|e|f|g|a|b>[#|+|-][len]	Note name. following #,+,- will shift semitone. Default length is used if no len is specified.
l	l[len]	Set default length. Initial default length=16, equivalent to l16. (sixteenth)
o	o[n]	Set octave. default=o4
>	>	Octave Down
<	<	Octable Up

GitHub repository is available at:
http://github.com/g200kg/LiveBeats/

IR files are from: http://www.voxengo.com/impulses/, licensed under: IMreverbs1 license.txt
Others: MIT License