Keeley Electronics is a guitar effects company founded in 2001 by Robert Keeley. Keeley studied electronics from 1995 to 1999 in Midwest City, Oklahoma and taught electronics for a couple of years before founding his company.

Source: Keeley Electronics website (14 February 2022)

Foxgear is an effects brand launched in late 2017, as a joint venture between two Italian effects brands: Gurus and Baroni-Lab. Manufacturing is done in Guangdong, China.

Source: Foxgear website (14 February 2022)

Empress Effects Inc. is a guitar and bass effects company based in Ottawa, Ontario. The company was founded by Steve Bragg and their effects are renowned for sophisticated digital control, preset storage and MIDI integration with analog technology. Empress Effects started in 2005, after Bragg had graduated from  Queens University with a degree in electrical engineering. His friend commissioned a tremolo effects unit with a unique set of features. By the time he had made it his friend no-longer needed it but Steve sold it at a local used instruments store. The store liked it so much that they ordered 10 more and Empress Effects was born.

Source: Empress Effects website (13 February 2022)

Caline Technology is an electronics company based in Shenzhen City, China. Their products include: Effects Pedals,Wah Pedals ,Tuners, Portable Power Supplies, Isolated Power Supplies, Pedal boards, Amplifiers, Guitar Straps & Wireless Audio - sold under the Caline and Scuru brand names.

Source: Caline website (13 February 2022)

AMT (Asia Music Technology) was the brand name used by AMT Electronics from 1991 until 2001. The company has its origins in Russia in 1982 when Sergie Marichev began building effects pedals, and then eventually electronic drum kits, and even MIDI instruments. In 1987, when private enterprise was permitted in Russia, Marichev launched his Asia company. In 1991 it was renamed Asia Music Technology company (AMT) and it was renamed again in 2001 to AMT Electronics.

There is also an AMT classical guitar brand - made in Asia. It is unclear whether this is related to AMT Electronics or not.

Source: AMT Electronics website (13 February 2022)

Headrush is a multi-fx brand owned by  inMusic Brands, Inc. Headrush launched around 2020 as a manufacturer of next generation guitar products like guitar multi-fx and amp modelers.

Source: Headrush website (8 February 2022)

Universal Audio was founded in 1958 by Bill Putnam Sr. as a maker of recording equipment. Putnam was the inventor of the modern recording console, the multi-band audio equalizer, and the vocal booth, and he was the first engineer to use artificial reverberation in commercial recording. Alongside his friend Les Paul, Putnam was also involved in the early development of stereophonic recording. Putnam started three audio product companies during his career: Universal Audio, Studio Electronics, and UREI. All three companies built equipment that remains widely used decades after their introduction, including the LA-2A and 1176 compressors, and the 610 tube recording console.