void CSoundFile::Panbrello(ModChannel *p, uint32 param) const
{
	if (param & 0x0F) p->nPanbrelloDepth = param & 0x0F;
	if (param & 0xF0) p->nPanbrelloSpeed = (param >> 4) & 0x0F;
}

The product reads data past the end, or before the beginning, of the intended buffer.