Consider making some sounds louder

[Nancy-Salpepi]

Test device
iPad Air 2 (name Leibniz)

Operating System
15.0.1

Browser
Safari

Problem description
phetsims/qa#717

Some sounds are much louder than others. For example, the grab sound is very easy to hear, but the thud sound made when the books come into contact is difficult to hear at times. With voicing enabled, I can't hear the thud sound or the filtered noise generator (rubbing books together) during an utterance. I found these sounds especially helpful for knowing when the books were/weren't touching--especially since the "move down to rub harder" hint isn't given after a lot of atoms have been removed.

Visuals

sounds.masked.mov

Troubleshooting information:
!!!!! DO NOT EDIT !!!!!
Name: ‪Friction‬
URL: https://phet-dev.colorado.edu/html/friction/1.6.0-dev.19/phet/friction_all_phet.html
Version: 1.6.0-dev.19 2021-10-08 22:59:15 UTC
Flags: pixelRatioScaling
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15
Language: en-US
Window: 1024x1224
Pixel Ratio: 2/1
WebGL: WebGL 1.0
GLSL: WebGL GLSL ES 1.0 (1.0)
Vendor: WebKit (WebKit WebGL)
Vertex: attribs: 16 varying: 15 uniform: 1024
Texture: size: 8192 imageUnits: 16 (vertex: 16, combined: 32)
Max viewport: 8192x8192
OES_texture_float: true
Dependencies JSON: {}

[Matthew-Moore240]

I don't think this should block friction. It could be lower quality speakers which don't handle multiple sounds very well or the speakers just don't have enough dynamic range. Closing.