Editing Tape recorder (section)

== Later developments ==
Since their first introduction, analog tape recorders have experienced a long series of progressive developments resulting in increased sound quality, convenience, and versatility.{{citation needed|date=August 2022}}

* Two-track and, later, multi-track heads permitted discrete recording and playback of individual sound sources, such as two channels for [[stereophonic sound]], or different microphones during live recording. The more versatile machines could be switched to record on some tracks while playing back others, permitting additional tracks to be recorded in synchronization with previously recorded material such as a rhythm track.
* Use of separate heads for recording and playback (three heads total, counting the erase head) enabled monitoring of the recorded signal a fraction of a second after recording. Mixing the playback signal back into the record input also created a primitive [[Delay (audio effect)|echo generator]]. The use of separate record and play heads allowed each head to be optimized for its purpose rather than the compromise design required for a combined record/play head. The result was an improved signal-to-noise plus an extended frequency response.
* Dynamic range compression during recording and expansion during playback expanded the available dynamic range and improved the signal-to-noise ratio. [[dbx (company)|dbx]] and [[Dolby Laboratories]] introduced add-on products in this area, originally for studio use, and later in versions for the consumer market. In particular, [[Dolby B]] noise reduction became very common in all but the least expensive cassette tape recorders.
[[File:OpenReel-GMS204.jpg|thumb|Solidyne GMS200 tape recorder with computer self-adjustment. Argentina 1980–1990]]
* Computer-controlled analog tape recorders were introduced by Oscar Bonello in Argentina.<ref>"A new tape transport system with digital control", Oscar Bonello, Journal of Audio Engineering Society, Vol 31 # 12, December 1983</ref> The mechanical transport used three DC motors and introduced two new advances: automated microprocessor transport control and automatic adjustment of bias and [[frequency response]]. In 30 seconds the recorder adjusted its bias for minimum [[Total harmonic distortion|THD]] and best frequency response to match the brand and batch of magnetic tape used. The microprocessor control of transport allowed fast location to any point on the tape.<ref>"Grabador Magnético profesional controlado por microprocesador", Rev Telegráfica Electrónica, Julio-Agosto de 1982</ref>