[Csnd] wterrain2 opcode in Csound for Android

I was listening to the Canonical reference manual example of the wterrain2 opcode in Csound for Android. It sounds bizarre, the pitch keeps modulating in odd ways (audio rendering here:)

I noticed the opcode in the included editor does not show the opcode in orange, which is the typical colour. Can anyone else using the Android version confirm this for me before I consider sending a ticket to github?

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Your recording, wterrain2 on Windows, and on an Android smartphone - all sound the same to me.

Hi there,
I have tested the wterrain2 opcode on Linux using Csound 6.17 (the official ArchLinux package) and there is no frequency instability. I get clean, stable notes. Just in case this might be a step towards a fix.

Best wishes,

Jeanette