HARDWAREPERIPHERIQUES ★ Cheetah MK5 Midi keyboard and Amstrad mini-interface ★

Audio - Cheetah Mk5 Midi Keyboard (Amstrad Computer User)Hardware Peripheriques
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Kitten on the keys

If making music is what you seek And your finance is quite meek Then Cheetah's keyboard is worth a peek Or so says our man — Dennis Leek PAYING around £130 to play tunes on your Arnold may sound unwise: When you get a Cheetah MK5 Midi keyboard and Amstrad mini-interface for your money, it starts to make more sense.

There are already plenty of musical software and hardware products available for the CPCs. Foremost are Rainbird's Advanced Music System, ideal for music students, and Gremlin's EMU , designed for programmers.

On the hardware side, RAM's Music Machine and Cheetah's AmDrum open up the worlds of sound sampling and digital drum machines. Cheetah's MK5, though, is the first product which allows you to play the CPC's sound chip from a full-size, professional quality keyboard, and to interface it with all kinds of Midi musical instruments.

Midi - for those of you who have been left behind by the biggest revolution to hit music-making since the nose flute -stands for Musical Instrument Digital Interface. It's a standard agreed by manufacturers of synthesisers and other musical instruments, which allows them to exchange information.
You can, for instance, link two synths together so that playing the keyboard of one will also play the other. Alternatively, you can use a computer or a dedicated sequencer to store musical information, which can then control any number of synths, drum machines and so on using the 16 available Midi control channels.

The mini-interface (note, mini as in Austin Rover, - not Midi), plugs into the CPC's expansion connector and has a trailing lead terminating in a five-pin DIN plug which connects to the back of the keyboard. The software is loaded from cassette, although it can then be transferred to disc.
Driven from a series of menus and windows, the sound programming software is easy to use and fairly sophisticated. The cursor keys and Enter are used to select options.

Stored sounds

Your first move is to load a file of sounds from the B side of the tape. Selecting the Play option allows you to play the chosen sounds with the MK5. Obviously, having your Arnold linked to some kind of external amplification aids sound quality no end.

Up to three notes can be played at a time, and the 64 available sound "patches" can be extensively edited using a graph display. Attack rate and step, decay rate and step, sustain level, release rate and step, tremolo speed, depth and delay, and various pitch repeat envelope parameters can all be edited.

A split point can be set so that different sounds are played from each half of the keyboard. Your edited sounds can then be stored to tape or disc, in banks of up to 64 at a time.

The display sometimes gets cluttered with unerased windows - these can be removed by returning to the main menu. Otherwise the software is quick and easy to use, and can get some good results from the relatively limited CPC sound chip.

Cheetah outpaces Lynx

If that were all the MK5 could do, though, it probably wouldn't be worth the investment. The fact is that the MK5 is a professional Midi master keyboard at a price which makes the £250 - £1500 price tag of Yamaha, Casio or Lynx products look sick. The MK5 isn't a musical instrument in itself. It doesn't create any noises. However, it can control any Midi equipped synth. This makes sense when you consider that synths such as the popular Yamaha DX100 and Casio CZ-101 feature difficult-to-play miniature keyboards. And, in the case of Midi sound modules such as the Yamaha FB-01, Korg EX-800 or various sound samplers, no keyboards at all.
It's cheaper in the long run to buy these keyboardless modules, and control them all from one master unit such as the MK5.
The MK5 has five octaves of full-size keys, and is housed in a strong metal case. On the back are the Midi output socket - a standard five-pin DIN - and power connector (the unit needs a 9V power supply, which is provided). On the top is a sideways-mounted pitch bend wheel, the Program/Play switch, four LEDs indicating Channel, Octave, Program and Program Mode, and a three-figure eight-segment LED.
Where, you might ask, are all the other controls? For economy, the top octave of the keyboard doubles as control keys: Just go into Program mode using the Program/Play switch, then use the keys to change the Midi control channel (1-16), Octave (+- 1 octave), Synth Program Number (1-128) and to transmit program changes.

The MK5 has only two problems: It will not transmit velocity information (so velocity-responsive synths will not play louder if you hit the keys harder); and it does not have a modulation wheel for introducing effects such as vibrato. The synth's own controls will normally provide this, though.
The MK5 has dozens of uses in any Midi-based home recording set-up, and so is likely to appeal to budget-minded musicians of all types, not just Arnold owners. If you already have Midi products such as EMR's Midi interface and software, it will help you to build up a computer music system to be proud of.

Amstrad User August 1987

★ PUBLISHER: CHEETAH MARKETING (Norbury House, Norbury Road. Fairwater, Cardiff. CF5 3AS)
★ YEAR: 1986
★ PRICE: £130


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★ AMSTRAD CPC ★ A voir aussi sur CPCrulez , les sujets suivants pourront vous intéresser...

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» Applications » EMR Miditrack Performer
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» Applications » 8 and 12 Track MIDI Sequencers


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L'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent  du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko.