audio: overhaul api for v4

[codecov-commenter]

Codecov Report

Merging #201 (889cf83) into release/v4.0.0 (625f93f) will decrease coverage by 0.16%. The diff coverage is n/a.

:exclamation: Current head 889cf83 differs from pull request most recent head 6228748. Consider uploading reports for the commit 6228748 to get more accurate results

@@                Coverage Diff                 @@
##           release/v4.0.0     #201      +/-   ##
==================================================
- Coverage           92.51%   92.35%   -0.17%     
==================================================
  Files                 137      137              
  Lines                6149     6149              
==================================================
- Hits                 5689     5679      -10     
- Misses                402      413      +11     
+ Partials               58       57       -1     

Impacted Files	Coverage Δ
drawLoop.go	37.34% <0.00%> (-9.64%)	:arrow_down:
loading.go	91.66% <0.00%> (-8.34%)	:arrow_down:
sceneLoop.go	93.10% <0.00%> (-3.45%)	:arrow_down:
shape/condense.go	100.00% <0.00%> (+4.68%)	:arrow_up:

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[200sc]

This should follow #198

[Implausiblyfun]

lgtm