public SoundMode2(bool gbc)
: base(0xff15, 64, gbc)
{
_volumeEnvelope = new VolumeEnvelope();
}
public SoundMode1(bool gbc) : base(0xff10, 64, gbc)
{
_frequencySweep = new FrequencySweep();
_volumeEnvelope = new VolumeEnvelope();
}