The PowerNoise is a fantasy sound chip designed by jvsTSX and The Beesh-Spweesh!. The Hexheld fantasy console incorporates a PowerNoise core into its HiveCraft SoC.
It is equipped with three configurable "noise" channels, as well as a unique "slope" channel for more traditional waveform synthesis. It also has two 8-bit bidirectional GPIO ports (similar to the AY-3-8910), but in the Hexheld these are reserved.
Each channel has a 4-bit "octave" value, which corresponds to the divider that the master clock signal is fed through before it increments the frequency counter. For example, a value of 1 means that the frequency counter is incremented every other cycle.