Function clearsong has 28 lines of code (exceeds 25 allowed). Consider refactoring.

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Protracker.prototype.clearsong = function()
{  
  this.title="";
  this.signature="";
  this.songlen=1;

Avoid deeply nested control flow statements.

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          if (n==this.baseperiodtable[np]) this.note[i][j*this.channels+c]=np;

Function effect_t0_ed has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring.

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Protracker.prototype.effect_t0_ed=function(mod, ch) { // ed delay sample
  if (mod.tick==(mod.channel[ch].data&0x0f)) {
    // start note
    var p=mod.patterntable[mod.position];
    var pp=mod.row*4*mod.channels + ch*4;            

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Avoid deeply nested control flow statements.

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        if (n==this.baseperiodtable[np]) this.note[i][j*this.channels+c]=np;

Avoid deeply nested control flow statements.

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          if (n==this.baseperiodtable[np]) this.note[i][j*this.channels+c]=np;

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          if (mod.flags&16) { // pattern jump/break?
            //console.log("break to pattern " + mod.patternjump + " row "+mod.breakrow);
            mod.position=mod.patternjump;
            mod.row=mod.breakrow;
            mod.patternjump=0;

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          if (!mod.tick) {
            // process only on tick 0
            mod.effects_t0[mod.channel[ch].command](mod, ch);
          } else {
            mod.effects_t1[mod.channel[ch].command](mod, ch);    

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          if (!(mod.channel[ch].command==0x0e && (mod.channel[ch].data&0xf0)==0xd0)) {
            n=(mod.pattern[p][pp]&0x0f)<<8 | mod.pattern[p][pp+1];
            if (n) {
              // noteon, except if command=3 (porta to note)
              if ((mod.channel[ch].command != 0x03) && (mod.channel[ch].command != 0x05)) {

Avoid deeply nested control flow statements.

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          if (mod.sample[mod.channel[ch].sample].loopstart || mod.sample[mod.channel[ch].sample].looplength) {
            if (mod.channel[ch].samplepos >= (mod.sample[mod.channel[ch].sample].loopstart+mod.sample[mod.channel[ch].sample].looplength)) {
              mod.channel[ch].samplepos-=mod.sample[mod.channel[ch].sample].looplength;
            }
          } else {

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          if (mod.sample[mod.channel[ch].sample].length > mod.channel[ch].samplepos)
            f=(1.0/mod.channels) *
              (mod.sample[mod.channel[ch].sample].data[Math.floor(mod.channel[ch].samplepos)]*mod.channel[ch].volume)/64.0;

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          for(var np=0; np<mod.baseperiodtable.length; np++)
            if (mod.baseperiodtable[np]>=mod.channel[ch].period) mod.channel[ch].note=np;

Avoid deeply nested control flow statements.

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          if (mod.channel[ch].period>=120)
            mod.channel[ch].semitone=mod.baseperiodtable[mod.channel[ch].note]-mod.baseperiodtable[mod.channel[ch].note+1];

Avoid deeply nested control flow statements.

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          if (n==this.baseperiodtable[np]) this.note[i][j*this.channels+c]=np;

Function setamigamodel has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

Open

Protracker.prototype.setamigamodel = function(amiga)
{
  if (amiga=="600" || amiga=="1200" || amiga=="4000") {
    this.amiga500=false;
    if (this.filterNode) this.filterNode.frequency.value=28867;

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Function effect_t0_e6 has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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Protracker.prototype.effect_t0_e6=function(mod, ch) { // e6 loop pattern
  if (mod.channel[ch].data&0x0f) {
    if (mod.loopcount) {
      mod.loopcount--;
    } else {

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Function effect_t1_0 has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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Protracker.prototype.effect_t1_0=function(mod, ch) { // 0 arpeggio
  if (mod.channel[ch].data) {
    var apn=mod.channel[ch].note;
    if ((mod.tick%3)==1) apn+=mod.channel[ch].arpeggio>>4;
    if ((mod.tick%3)==2) apn+=mod.channel[ch].arpeggio&0x0f;

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Function createContext has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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Protracker.prototype.createContext = function()
{
  if ( typeof AudioContext !== 'undefined') {
    this.context = new AudioContext();
  } else {

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Avoid too many return statements within this function.

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    return true;

Avoid too many return statements within this function.

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    return true;

Function effect_t1_3 has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

Open

Protracker.prototype.effect_t1_3=function(mod, ch) { // 3 slide to note
  if (mod.channel[ch].period < mod.channel[ch].slideto) {
    mod.channel[ch].period+=mod.channel[ch].slidetospeed;
    if (mod.channel[ch].period > mod.channel[ch].slideto)
      mod.channel[ch].period=mod.channel[ch].slideto;

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