if i set AudioSpectrumInterval to faster value as default (0.1) for example to 0.02 function spectrumDataUpdate returns same values

step to reproduce:
load any chart demo witch using spectrumDataUpdate (audio visualization) and set AudioSpectrumInterval to 0.02 and print values of magnitudes each update of spectrum data

result: for magnitudes[0] + 60.0

25.30990982055664
25.30990982055664
25.30990982055664
16.35150146484375
16.35150146484375
16.35150146484375
13.008472442626953
27.34347915649414
27.34347915649414
0.0
0.0
29.151962280273438
23.044506072998047
31.829599380493164
31.829599380493164
31.829599380493164

spectrumDataUpdate returns same magnitudes values