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Wavelet is great, if my phone stops supporting it i would buy an old lg tested phone and root it to get wavelet to work at its best, although it does work well without rooting at least on a Galaxy fold 4
I have the 4xx plugged in as I write. As long as it's recognized as a high Impedance device no problem. Sometimes for reasons unknown it treats it as a "normal" device which requires cranking the volume but still adequate.