boxes otherwise commonly used to connect more than one tape recorder to a single tape recorder connector on an amplifier/receiver. The drawbacks were that connecting any mono recorder with pin 1 joined to 4 and pin 5 joined to 3 (a common practice to make mono recorders record both channels in parallel and reproduce in both channels) would make all tape sounds mono. Also any tape recorder with three heads, used for monitoring while recording, needs an extra lead between the recorder and the amplifier to be able to monitor the recording through the amplifier and speakers. On Philips amplifiers/receivers and three head recorders that extra socket is labeled Monitor while the regular socket is labeled Tape. Another drawback is the possible confusion when interconnecting with other equipment, where a person sometimes would use a straight pin-to-pin cable and sometimes use a special "copying" cable with pin 1 swapped with pin 3 and pin 4 swapped with pin 5. Sometimes a person would also need to lower the signal to make a line output fit a microphone level input. This interface was rare outside products for the European market, and has progressively disappeared on new equipment, both in Europe and worldwide, since the 1980s, in favour of RCA connectors. Non-European products intended for the European market commonly combined both DIN and RCA connectors, with cassette decks having both and amplifiers/receivers commonly having RCA connectors for everything and an additional 5-pin DIN connector for at least one tape connection, usually in parallel with a set of RCA connector for the same input/output. Other uses The 5/180° connectors are commonly used for: SYNC or MIDI interface for electronic musical instrument Peripherals or power connectors for personal computers from the 1980s Audio in the original HME wireless communicators (It is the headset connector for inbound and outbound audio for drive-through restaurants.) Controlling tilt of UMTS antennas (Antenna Interface Standards Group) Connecting two controllers for radio controlled model aircraft together for training purposes The DIN connector saw several other uses apart from audio. It was particularly popular as a connector for various home computers and video game consoles. Analogue theatrical lighting control (pre-dating the more recent digital control protocols such as DMX) commonly used the 8-pin (45°) DIN connector, six of the pins being 0–10V control signals for six separate dimmer circuits, and the other two a 0V reference and a DC source for