percussion!

static/qrplay/v2c.html

@@ -37,6 +37,8 @@ T=[];
 u=137;
 // volume. 40 is default, 35 is half, 30 is half again.
 v=40;
+// percussion can be approximated as 1024th notes.
+P=x=>(s=`z99l-5${x}o${o+4} l${Math.log2(l)} z${Z} x`+s.slice(c),c=0,T[99]=t);
 for(
 	c=t=k=Z=0;D=s[c+1],E=D+s[c+2],C=s[c++];
 	// no match
@@ -44,16 +46,21 @@ for(
 	// comments
 	z<2?k=z:k?0:
 	// - + octave
-	z<4?o+=C+12|0:
+	z<4?o+=C+1|0:
 	// dots and triplets
 	z<5?l*=3/2:
 	z<6?l/=3:
-	// note or rest (percussion not implemented)
+	// percussion
+	C==`0`?P(`o07g`):
+	C==`1`?P(`o05b+c#deff#gg#aa#b+cc#d`):
+	C==`2`?P(`o06g++ddb--g++ddb--g++ddb--g++ddb`):
+	C==`6`?P(`o05a++c#-aae+e--a++c#-aae+e--a++c#`):
+	// note or rest
 	z<23?(
 		z-=6,
 		O=new OscillatorNode(A,{
 			type:`square`,
-			detune:100*(z*2-(z>3)-(D==`!`)+(D==`#`)+o-9)
+			detune:100*(z*2-(z>2)-(D==`!`)+(D==`#`)+12*o-9)
 		}),
 		G=new GainNode(A,{gain:z<7&&.5**(12-v/5)}),
 		O.connect(G),
@@ -66,12 +73,16 @@ for(
 	// set note length
 	z<31?l=2**(z-25):
 	// change channel
-	z<32?(T[Z]=t,t=T[Z=E]|0,c+=2):
+	z<32?(T[Z]=t,t=T[Z=E|0]||0,c+=2):
 	// change tempo
 	z<33?u=E+s[c+=2,c++]:
 	// change volume
-    (v=E,c+=2)
+    z<34?(v=E,c+=2):
-)z=`\n;-+.3cdefgab012456789x@jtsiqhwzuv`.indexOf(C)
+	// set octave
+	z<35?(o=E-4,c+=2):
+	// set length
+	(l=2**E,c+=2)
+)z=`\n;-+.3cdefgab012456789x@jtsiqhwzuvol`.indexOf(C)
 '>#play</button> <button onclick=f.A.close()>#stop</button>
 <!-- stop snipping here -->
 </center>