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Expected 'MHdr', got: '"+i.id+"'";for(var a=function(t){var e=new r(t),n={format:e.readUInt16(),numTracks:e.readUInt16()},i=e.readUInt16();return 32768&i?(n.framesPerSecond=256-(i>>8),n.ticksPerFrame=255&i):n.ticksPerBeat=i,n}(i.data),o=[],s=0;!n.eof()&&s<a.numTracks;s++){var c=n.readChunk();if("MTrk"!=c.id)throw"Bad MIDI file.  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u=31&e.hour|{24:0,25:32,29:64,30:96}[e.frameRate];t.writeUInt8(u),t.writeUInt8(e.min),t.writeUInt8(e.sec),t.writeUInt8(e.frame),t.writeUInt8(e.subFrame);break;case"timeSignature":t.writeUInt8(255),t.writeUInt8(88),t.writeVarInt(4),t.writeUInt8(e.numerator);var h=255&Math.floor(Math.log(e.denominator)/Math.LN2);t.writeUInt8(h),t.writeUInt8(e.metronome),t.writeUInt8(e.thirtyseconds||8);break;case"keySignature":t.writeUInt8(255),t.writeUInt8(89),t.writeVarInt(2),t.writeInt8(e.key),t.writeUInt8(e.scale);break;case"sequencerSpecific":t.writeUInt8(255),t.writeUInt8(127),t.writeVarInt(s.length),t.writeBytes(s);break;case"unknownMeta":null!=e.metatypeByte&&(t.writeUInt8(255),t.writeUInt8(e.metatypeByte),t.writeVarInt(s.length),t.writeBytes(s));break;case"sysEx":t.writeUInt8(240),t.writeVarInt(s.length),t.writeBytes(s);break;case"endSysEx":t.writeUInt8(247),t.writeVarInt(s.length),t.writeBytes(s);break;case"noteOff":(c=(!1!==n&&e.byte9||n&&0==e.velocity?144:128)|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.noteNumber),t.writeUInt8(e.velocity);break;case"noteOn":(c=144|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.noteNumber),t.writeUInt8(e.velocity);break;case"noteAftertouch":(c=160|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.noteNumber),t.writeUInt8(e.amount);break;case"controller":(c=176|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.controllerType),t.writeUInt8(e.value);break;case"programChange":(c=192|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.programNumber);break;case"channelAftertouch":(c=208|e.channel)!==r&&t.writeUInt8(c),t.writeUInt8(e.amount);break;case"pitchBend":(c=224|e.channel)!==r&&t.writeUInt8(c);var 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n=0;t.tracks[0].forEach((function(t){n+=t.deltaTime,t.meta&&("trackName"===t.type?r.name=t.text:"text"!==t.type&&"cuePoint"!==t.type&&"marker"!==t.type&&"lyrics"!==t.type||r.meta.push({text:t.text,ticks:n,type:t.type}))})),this.update()}}return t.prototype.update=function(){var t=this,e=0,r=0;this.tempos.sort((function(t,e){return t.ticks-e.ticks})),this.tempos.forEach((function(n,i){var a=i>0?t.tempos[i-1].bpm:t.tempos[0].bpm,o=n.ticks/t.ppq-r,s=60/a*o;n.time=s+e,e=n.time,r+=o})),this.timeSignatures.sort((function(t,e){return t.ticks-e.ticks})),this.timeSignatures.forEach((function(e,r){var n=r>0?t.timeSignatures[r-1]:t.timeSignatures[0],i=(e.ticks-n.ticks)/t.ppq/n.timeSignature[0]/(n.timeSignature[1]/4);n.measures=n.measures||0,e.measures=i+n.measures}))},t.prototype.ticksToSeconds=function(t){var e=(0,n.search)(this.tempos,t);if(-1!==e){var r=this.tempos[e],i=r.time,a=(t-r.ticks)/this.ppq;return i+60/r.bpm*a}return t/this.ppq*.5},t.prototype.ticksToMeasures=function(t){var 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