"fundamental to the process of generating the music". Computers running Music Macro Language were used to produce the game's sound effects. Yamada explained that taking away the sound of charging up the Mega Buster allowed for many more sound waves that it would have obscured or blocked out. Still, as a spiritual successor to Mega Man 2, layers of background music were deliberately designed to drop out when simultaneously heard with certain sound effects as they did in that game. Release Capcom officially announced Mega Man 9 during July 2008. Official details were first confirmed via the magazines Weekly Famitsu and Nintendo Power, revealing that the title would be appearing on the Nintendo Wii as a WiiWare title. It was initially slated to be exclusive to WiiWare, with earlier reports of Microsoft's XBLA and Sony's PSN editions being denied by Capcom. Gaming sites like IGN confirmed it for PSN and XBLA shortly thereafter. Various regions including North America, Japan, Europe, and Australia saw releases of the game between September 2008 and June 2009. A mobile phone incarnation of Mega Man 9 was also released in Japan in late 2010. The North American promotional artwork for the game, designed by Gerald de Jesus of iam8bit, was meant to be reminiscent of the domestic cover art for the original Mega Man game. According to Capcom employee Chris Kramer, the marketing group felt that if they were going to release a game that graphically resembled one that came from 1987, it would be best to have the marketing campaign reflect that. T-shirts bearing the artwork were created for Inafune and Takeshita to wear at the game's official debut at the Electronic Entertainment Expo during the summer of 2008. The T-shirts were later made available to the public via Capcom's online store. A "limited edition" press kit, intended for members of the media, using that same cover art was then created by iam8bit. Being as faithful to the original 1987 release as possible, the iam8bit crew disassembled one-thousand vintage NES cartridges and inserted mini CDs inside. Though the CDs do not contain the actual game, they feature an array of screenshots, artwork, and game information. That was then packaged in a custom-created, classic-looking NES box, complete with shrink-wrap and bargain bin price tags. The press kit was also put on sale at Capcom's store. To help promote the game in Japan, Capcom released merchandise