Effects Added:
20xy - Change Noise Mode:
This effect will change the way in which the SN76489 makes the noise.
Value x sets the special noise mode, if it is set to 0 only 3 frequencies can be done: C, C# and D.
If it is set to a non 0 value, the noise can reach any frequency but the third square of the SN76489 will be turned off. The Noise channel will use the frequency of the third Square.
Value y sets the type of noise, setting it to 0 will enable the periodic noise mode, if it is set to a non zero value, white noise generation will be enabled.
Keep in mind that, after changing this value, you have to play the current track in order to update the emulator noise mode.