One player per interval. Every sound is generated in the browser, so nothing loads and nothing streams.
SOURCE, the mnemonics below are transcribed from your own reference sheet, "Melodic Intervals (Ascending)". Nothing was substituted for what you wrote.
anchorpulledtensesweetstablecharacteristic
Families come from Burge's grouping in ear-training-reference: stable (P4, P5, P8), sweet (m3, M3, M6), tense (M2, m7), pulled (m2, M7), characteristic (TT).
Quiz yourself
A random interval plays, you name it. Wrong answers replay so the miss gets corrected while the sound is still in your ear.