Grab/Release sounds for soccer balls

[jbphet]

While working on the grab and release sounds for the candy bars on the "Distribute" screen (see #190), I noticed that we do not have such sounds for grab and release of the soccer balls on the "Balance Point" screen. This seems a little inconsistent, so I thought I'd raise the question of whether we want to add sounds for this.

Note that the code for the soccer balls comes from the soccer-common repo, which is also heavily used in the Center and Variability sim, which also lacks sounds for grabbing and releasing the soccer balls. We should consider whether this behavior should also change if we add sounds for grabbing and releasing the soccer balls in Mean: Share and Balance.

[emily-phet]

My memory is that we specifically chose not to have grab and release sounds for the soccer balls, as they are intimately tied to the sound of their location. When you interact directly with the soccer balls, you should hear the sound (tone) associated with its new location, in lieu of a distinct grab/release sound. We thought that adding a release sound wasn't needed, as you already hear the tone representing the new location, and the grab sound seemed like it would clutter up the mapping we were aiming for.

[amanda-phet]

I agree with @emily-phet that additional grab/release sounds aren't useful here. The number line tone is the useful thing. Since it's discrete, I also don't think grabbing and releasing are noticeable actions.. the noticeable thing is the location where the soccer ball is sitting.

[jbphet]

Sounds good, thanks for the explanations. Closing.