Analog synthesizer

The earliest analog synthesizers in the 1920s and 1930s, such as the Trautonium, were built with a variety of vacuum-tube (thermionic valve) and electro-mechanical technologies. After the 1960s, analog synthesizers were built using operational amplifier (op-amp) integrated circuits, and used potentiometers (pots, or variable resistors) to adjust the sound parameters. Analog synthesizers also use low-pass filters and high-pass filters to modify the sound. While 1960s-era analog synthesizers such as the Moog used a number of independent electronic modules connected by patch cables, later analog synthesizers such as the Minimoog integrated them into single units, eliminating patch cords in favour of integrated signal routing systems.

Use in modern music[edit]

The lapse of patents in recent years, such as for the Moog synthesizer transistor ladder filter, has spurred a return of DIY and kit synthesizer modules, as well as an increase in the number of commercial companies selling analog modules. Reverse engineering has also revealed the secrets of some synthesizer components, such as those from ARP Instruments, Inc. In addition, despite the widespread availability during the 2000s of relatively inexpensive digital synthesizers that offered complex synthesis algorithms and envelopes, some musicians are attracted to the sounds of monophonic and polyphonic analog synths. While some musicians embrace analog synthesizers as preferable, others counter that analog and digital synthesis simply represent different sonic generation processes that both reproduce characteristics the other misses.^[4] Another factor considered to have increased use of analog synths since the 1990s is weariness with the complex screen-based navigation systems of digital synths, with the "hands-on", practical controls of analog synths – potentiometer knobs, faders, and other features – offering a strong appeal.