WAVE.js | class library for conversion / editing wave files | Canvas library

I created a simple catalog item component using stencil.js. In the component there is canvas tag that on it I painted animating curved lines. At the componentDidLoad function, I define the canvas, initialize it and call the animate function. This is the code of the component itself:

I'm trying to use a Python script to generate some header and source files for my C++ code and move them to the appropriate source directories, as the subsequent C++ build requires them.

Here's what the current iteration of my code looks like :

I would like to declare the property soundFileName as var soundFileName = 'audio/60.wav'; so that soundFileName isn't defined globally, but when I do I get ReferenceError: soundFileName is not defined.

I am passing the value of soundFileName as a parameter to loop(soundFileName), and I would think the value 'audio/60.wav' should pass along just fine.

I suspect this has something to do with scope or nesting but I'm not sure how to resolve the issue. The code does work when I use soundFileName = 'audio/60.wav'; without var.

What am I missing? Thanks!

EDIT: Code now working and updated!

I apologize if my use of terminology is inaccurate. I'm a novice.

I have a long list of variables that are being shared/used by the function loop(). I am currently only calling loop() twice and only passing unique arguments for the sound file link. I am going to scale this code up so that I will have many calls to loop() but each with a unique set of arguments replacing my long shared list of variables. I think it will be a bit messy and confusing to have a long list of unique arguments for each call to loop(). Is there a way that I can keep things readable and organized by making different variable lists that can only be accessed by the parameters for a specific call to loop()? Something like this pseudocode:

I am trying to implement the seek() function using howler.js, but I can't figure out how to implement it. I'm a novice javascript programmer, so it's probably something simple, but I can't find any useful examples elsewhere. My code works as expected otherwise, I just want to add the ability to start the audio playing at times other than the beginning. For example, when a sound starts, it might begin at four seconds in instead of 0. sound.seek([300], id2); is what I'm trying to implement below.

I know it's a beginner's question but I have a bit of trouble with html / javascript. I learned about the setTimeout (function, time) and I knew how to use it by creating a function. However, I was wondering if it is possible to use this setTimeOut for Aframe.registercomponent my other scripts? I didn't find anything on that and all my attempts failed.

For example for the "audioanalyser-waveform":

Probably I am plain stupid but I need help with a simple thing.

I want to change the speed of the sine wave from normally 2 to 10 when a button is clicked. Nothing more, but I cant figure out how to do it.

Github Link to the SineWave.js: Sinewave.js

The Code: