TC Helicon
- Vocal audio equipments such as VoiceWorks for multi-voice harmonies and pitch correction. Company and products information.
- http://www.tc-helicon.com/

Eventide Inc.
- Features Harmonizers and other effect processors. Company profile, products catalog, information on dealers and distributors.
- http://www.eventide.com/

AudioPervert Electronics (APE)
- Custom built analog processors for audio production.
- http://electronics.audiopervert.com/

Collier Electronics
- Manufactures patented parametric equalizers. Includes background information to electronic technique used by Collier patented method, general physics information and music links.
- http://home.flash.net/~rcollier/

Empirical Labs Inc.
- A US electronic design and manufacturing firm. Makers of the Distressor and Fatso audio hardware products.
- http://empiricallabs.com

Aphex Systems, Ltd.
- Professional audio systems. Developer of signal processing, dynamics control and conversion systems.
- http://www.aphex.com/

TC Electronic
- Signal processors for live and studio applications.
- http://www.tcelectronic.com/

Presonus
- Signal processors, compressors, limiters, mic preamps, de-esser, equalizers.
- http://www.presonus.com/

JSK Engineering
- High end post production and re-recording audio equipment for sound stages and film sound; motion controllers, distribution amps, time code generators.
- http://www.jskengineering.com

Fultek Audio
- Specializing in the design, manufacturing and consultation of electronic audio equipment for the entertainment industry.
- http://www.fultek.com/

dbx Professional
- Digital processors, noise reduction and EQ products.
- http://www.dbxpro.com

BSS Audio
- Makers of signal processors.
- http://www.bss.co.uk/

Orban, Inc.
- Audio processing and editing equipment for broadcast radio and TV applications.
- http://www.orban.com/

Digital Audio Denmark
- Digital AD/DA and DD audio converters and digital radio and music studio audio equipment.
- http://www.digitalaudio.dk/

Ashly Audio Inc.
- This audio manufacturer produces power amplifiers, signal processors and mic mixers.
- http://www.ashly.com

Manley Laboratories, Inc.
- Designer and manufacturer of pure vacuum tube processors for professional audio. Also high-end home HiFi equipment.
- http://www.manleylabs.com/