qrplay

qrplay by nycki and SArpnt

a QR-code sized implementation of ZZT Play, which you may know from the ZZT Hall of Music.

I designed this because I wanted a program I could print on a business card, and SArpnt found some clever ways to shrink it even further. The source on this page is commented, the source in the QR code is minified.

paste ZZT music code in this box, then click the button to #play!

qrplay v2c

qr codes

for security reasons, your phone probably won't open these as links. you'll have to copy and paste the text into your browser by yourself. it requires no permissions or internet access to run.

qrplay v2: added percussion, chords, volume control, sample song.

qrplay v2

data:text/html,<meta%20name=viewport%20content=initial-scale=1><center><p><a%20href=http://nycki.net/qrplay>qrplay%20v2c</a></p><textarea%20id=f%20style=width:min(40em,99%);height:9lh>;%20%23title%20nupa's%20theme%0A;%20%23authors%20nycki%20bsp%0Az00%0A@qcceg%20hcqeg%20dcdc%20d%23h.d%0A@qcceg%20hcqeg%20dcd%23d%20wc%0Az01%0A@-wc%20b!%20a%20a!%0A@-wc%20b!%20haqa!g%20w-c</textarea><p><button%20onclick='s=`@`+f.value.toLowerCase();f.A?.close();A=f.A=new%20AudioContext;T=[];L=[];u=137;v=40;for(c=t=k=Z=0;D=s[c+1],E=D+s[c+2],C=s[c++];z<0?0:z<2?k=z:k?0:z<4?o+=C+1|0:z<5?l*=3/2:z<6?l/=3:z<14?(z-=6,O=new%20OscillatorNode(A,{type:`square`,detune:100*(z*2-(z>2)-(D==`!`)+(D==`%23`)+12*o-9)}),G=new%20GainNode(A,{gain:z<7&&.5**(12-v/5)}),O.connect(G),G.connect(A.destination),O.start(t),O.stop(t+=7.5*l/u)):z<23?(s=`z99o06${["+g","-b+c%23deff%23gg%23aa%23b+cc%23d","g++ddb--g++ddb--g++ddb--g++ddb","+ea-g--b++g++c%23----b++g+cd%23-g+cec","a%23ga%23g-a%23+g-b+g","-a++c%23-aae+e--a++c%23-aae+e--a++c%23","-fffeeed%23d%23dddc%23c%23c%23","dddddedc%23ded%23fee","--ba%23bb-a+a%23-baaa+a%23bb-a",][z-14]}z${Z}%20o${o+4}%20x`+s.slice(c),c=0,T[99]=t,L[99]=u/2**12):z<24?(o=0,l=1):z<31?l=2**(z-25):z<32?(T[Z]=t,L[Z]=l,t=T[Z=E|0]||0,l=L[Z]||l,c+=2):z<33?u=E+s[c+=2,c++]:z<34?(v=E,c+=2):(o=E-4,c+=2))z=`\n;-+.3cdefgabx012456789@jtsiqhwzuvo`.indexOf(C)'>%23play</button>%20<button%20onclick=f.A.close()>%23stop</button>

qrplay v1: proof of concept. musical notes only.

qrplay v1

data:text/html,<meta%20name="viewport"%20content="width=device-width%20initial-scale=1.0"><textarea%20id=f></textarea><br><button%20onclick='/*qrplay%20v1,%20nycki%20&%20SArpnt,%202025*/v=f.value;T=[];Z=0;f.A=A=f.A||new%20AudioContext;B=new%20GainNode(A,{gain:0.4});B.connect(A.destination);for(i=o=k=t=0,l=1;c=v[i++],d=v[i],c;z<0?0:z>29?k=1:z>28?k=0:k?0:z>27?(T[Z]=t,Z=+v.slice(i,i+=2),t=T[Z]||0):z>17?t+=l:z<3?z?o+=g:(o=0,l=1/8):(console.log(z),z)&1?console.log(l=g):(a=new%20OscillatorNode(A,{type:`square`,detune:100*(g+o+(d==`%23`)-(d==`!`))}),a.connect(B),a.start(t*.4),t+=l,a.stop(t*.4)))g=[,-12,12,4,-9,2,-7,1,-5,.5,-4,.25,-2,1/8,0,l/3,2,l*1.5][z=`@-+wchdqeifsgta3b.x012456789z\npovukr\x27`.indexOf(c.toLowerCase())]'>%23play</button><button%20onclick='f.A.close();f.A=0'>%23stop</button>

song: Solfeggettio in C Minor

;; title Solfeggettio ;; artist JS Bach @i-e!ce!g+ce!dc-bgb+dgfe!de! @ice!g+ce!dcdc-bagfe!d @ie!ce!g+ce!dc-bgb+dgfe!d @i+e!ce!g+ce!dcdc-bagfe!d @i+e!c-ge!c++c-ge!a!--fa!+cfa!+ce! @i+d-b!fd-b!++b!fdg--e!gb!+dgb!+d @i+ge!dc-ge!dh.c

song: We Will Rock You

U137V40 @s.9x9x6xxx9x9x6xxx9x9x6xxx9x9x6xxx @s.deedi.es.eei.des.de @s.edi.es.eeedi.eags.g-b+dx @s.ei.es.dexxdexexe @s.xxxdddxdd-bxage+eq.x @q.gf#eds.exex6xxx9x9x6xxx @q.gf#eds.exex6xxx9x9x6xxx @s.deedi.es.eei.des.de @s.edi.es.eeedi.eags.g-b+dx @s.ei.es.dexxdexexe @s.xxxdddxdd-bxage+eq.x @q.gf#eds.exex6xxx9x9x6xxx @q.gf#eds.exex6xxx9x9x6xxx @q.gf#eds.exex6xxx9x9x6xxx @q.gf#eds.exex6xxx9x9x6xxx

command reference

cdefgab: play a note in the current octave.

012456789: play one of various percussion effects. note that there is no effect 3.

x: rest for the length of a note.

-+ change octaves. default is the 4th octave, the one containing middle C.

whqistj: change note length to whole, half, quarter, eigth, sixteenth, thirtytwoth, or sixtyfourth. default is t.

3: cut the current note length into triplets. for instance, q3ceg would play three notes that are each 1/3 the length of a quarter note.

.: dotted note. increases the current note length by 50%. for instance, q.c would play a note that lasts 1.5 times a quarter note.

@: reset octave and note length to defaults.

;: comment. everything from a semicolon until the end of the line is ignored. you can put the name of your song in here!

znn: select track. you can use this to play two or more tracks at once! so for instance, z00c z01+c would play an octave chord. tracks greater than 15 are reserved for internal use.

unnn: set tempo in beats per minute. for historic reasons, u137 is the default.

vnn: set volume, from 00 to 99. this scales exponentially: 40 is the default, then 45 is double that, then 50 is double that, etc.

onn: set octave, from -9 to 99, but you should really only use 00 thru 08. default is 04.

loops! I'm thinking of implementing something brainfuck-esque so you can make turing machine music... we'll see.

there's a known bug where you can't play two percussion effects on different channels at the same time. but like, if I hadn't told you, I don't think you would have noticed.

change tuning! currently this is tuned to A440 but ZZT is actually slightly out of tune and it would be cool to replicate that.

slides and bends. ZZT Ultra has these and I could probably figure them out but I'd have to rework it to fit in the qr code.

compression: maybe I could rewrite this whole thing to use uppercase letters only so it fits in the QR alphanumeric mode? I'd have to escape every punctuation mark though. might experiment with this later.