AudioWaveform Source Edits

[DanH]

@Christoph-Hart do you happen to know where in the source code lies the bit for the green sample start line in the AudioWaveform window pretty please?! (the green one at the start in the image below...)

[ustk]

@danh I'd like to help but I'm not even able to connect a Waveform Tile to a sampler without getting an instant crash...

[ustk]

@danh Is that an AudioWaveform component or a Waveform Tile you use?

[DanH]

@ustk AudioWaveform