Method setStop

include/dsp/midi.hpp:228–241

	}

	void setStop(bool stop) {
		if (this->stop == stop)
			return;
		this->stop = stop;
		if (stop) {
			// Stop
			midi::Message m;
			m.setSize(1);
			m.setStatus(0xf);
			m.setChannel(0xc);
			m.setFrame(frame);
			onMessage(m);
		}
	}

	void setFrame(int64_t frame) {
		this->frame = frame;