The Uher SG 631 Logic is an analog tape recorder developed by Uher in the late 1970s. It is designed specifically for recording and manipulating electronic music and logic sequences, making it a popular choice among electronic musicians and composers.Some key features of the Uher SG 631 Logic include:1. Four tracks: The Uher SG 631 Logic has four separate recording tracks, each capable of recording at a speed of up to 15 inches per second (ips).2. Low noise and wide frequency response: The machine features a low noise floor and a wide frequency response, making it ideal for reproducing delicate electronic signals with clarity and precision.3. Electronically balanced inputs: The input connections on the machine are electronically balanced, which helps to reduce external interference and improve signal-to-noise ratio.4. Ergonomic design: The Uher SG 631 Logic has a user-friendly design, with prominent cueing and rewind/fast forward buttons that enable quick and precise operation.5. Variable speed playback and recording: The machine can alter the playing and recording speeds by +/- 10% cent, allowing for creative experimentation with pitch and tempo.Overall, the Uher SG 631 Logic represents a significant advancement in the field of analog tape recording, offering high fidelity and flexibility for electronic music production. Its continued popularity among musicians and composers today is a testament to its enduring appeal and significance in the evolution of electronic music technology.