playWave abstract method
Play a wave of the given waveType at the given frequency through this
channel.
If waveType is WaveType.sine, then partials are ignored.
If partials is < 1, then StateError is thrown.
Implementation
Wave playWave({
required final WaveType waveType,
required final double frequency,
final int partials = 1,
final double gain = 0.7,
});