Editing Acorn Electron (section)

====Sound Expansion cartridge====
Originally announced in 1987 by Project Expansions to be priced at around £40,<ref name="electronuser198710se">{{ cite magazine | url=https://archive.org/details/ElectronUserVolume5/Electron-User-05-01/page/n4/mode/1up | title=Electron gets Micro sound | magazine=Electron User | volume=5 | issue=1 | date=October 1987 | access-date=21 January 2021 | page=5 }}</ref> the Sound Expansion cartridge could be fitted in a Plus 1 (or compatible) slot and provide sound output equivalent to that of the BBC Micro, with Superior Software's Speech bundled as a "limited offer".<ref name="electronuser198801">{{ cite magazine | url=https://archive.org/details/ElectronUserVolume5/Electron-User-05-04/page/n53/mode/1up | title='2' New Products for the Electron | magazine=Electron User | volume=5 | issue=4 | date=January 1988 | access-date=22 January 2021 | page=54 }}</ref> A product of the same name and with similar functionality was subsequently sold by Complex Software for around £55, employing its own adjustable speaker in the cartridge unit.<ref name="electronuser199005">{{ cite magazine | url=https://archive.org/details/ElectronUserVolume7/Electron-User-07-08/page/n33/mode/2up | title=Eloquent Electron | magazine=Electron User | volume=7 | issue=8 | date=May 1990 | access-date=21 January 2021 | last1=Davidson | first1=Pete | pages=34–35 }}</ref> Superior Software had announced a version of Speech for the unexpanded Acorn Electron in 1986,<ref name="acornuser198604_electron_discounts">{{ cite magazine | url=https://archive.org/details/AcornUser045-Apr86/page/n10/mode/1up | title=Electron discounts revitalise market | magazine=Acorn User | date=April 1986 | access-date=23 February 2023 | pages=9 }}</ref> but this was never released.