This page tests animating pitch while seamlessly looping an audio clip. Files:

car_acceleration_high_44100hz_706kbs_mono_int16.wav: Obtained from Unity StandardAssets project: https://www.assetstore.unity3d.com/en/#!/content/32351
car_acceleration_high_8000hz_128kbs_mono_int16.wav: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with with Audacity 2.1.3 Win64
car_acceleration_high_48000hz_768kbs_mono_int16.wav: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with with Audacity 2.1.3 Win64
car_acceleration_high_88200hz_1411kbs_mono_int16.wav: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with with Audacity 2.1.3 Win64
car_acceleration_high_96000hz_1536kbs_mono_int16.wav: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with with Audacity 2.1.3 Win64
car_acceleration_high_44100hz_101kbs_mono_ffmpeg2.2.2_aac.m4a: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with Audacity 2.1.3 Win64 + FFmpeg 2.2.2, with option Quality: 250
car_acceleration_high_44100hz_239kbs_mono.ogg: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with Audacity 2.1.3 Win64, with option Quality: 10
car_acceleration_high_44100hz_110kbs_mono_lame3.99.mp3: Converted from car_acceleration_high_44100hz_706kbs_mono_int16.wav with Audacity 2.1.3 Win64 + Lame MP3 encoder 3.99.3, with options Bit Rate Mode: Preset, Quality: Standard 170-210 kbps, Variable Speed: Fast, Channel Mode: Stereo

Play uncompressed (Web Audio + AudioBufferSourceNode + decodeAudioData() to AudioBuffer):

Play compressed (<audio> element playing a Blob embedded as MediaElementAudioSource to Web Audio graph):

Current memory usage: 0 bytes.