A sequel to Amplitude (2003), it was licensed by Sony Computer Entertainment, who owns the rights to Frequency and the original game.

[8] Harmonix's Ryan Lesser stated the choice for using Kickstarter was based on knowing that demand was high for a sequel to Amplitude, and opted to use the crowd-funding mechanism to see if it was a viable vehicle for future projects for the company.

[10] Harmonix noted that the game would be exclusive to PlayStation platforms, as the Amplitude concepts and trademark remain property of Sony.

[16] The Digital Fix gave it a score of eight out of ten, calling it "a unique concept album that challenges your mind and your dexterity".

[23] Slant Magazine similarly gave it four stars out of five, saying that it was "so obviously a labor of love that it's difficult to criticize it, especially given all of the ways in which Harmonix has addressed the concerns for fans who funded them on Kickstarter".

[24] However, The Escapist gave it three-and-a-half stars out of five: "While some more star power in the soundtrack would have went a long way, and the way Harmonix artificially pads the game's length with its song unlock requirements is ridiculous, Amplitude remains an exciting blend of rhythm action and electronica that does well by its predecessors".

[27] The Daily Telegraph similarly gave it three stars out of five, saying that the game "has a thumping heart and soul, a timeless nucleus of gameplay that I hope Harmonix has the opportunity to build upon.