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ARP | Quadra
The Quadra is pretty much a hybrid version of ARP's Omni II and Solus synths. It's a four-section synthesizer consisting of a Bass synth, Poly synth, Lead synth, and String synth. It is quite good at emulating each of these sounds and can function in any of its four modes at a time with the ability of layering the different sections! Sounds you create in any of the four sections are instantly recalled from memory by the push of a button! There are 16 program patches for storing your sounds. Other major features are the incredible phase shifter, tons of balanced audio outputs for each section, dual portamento controls and an arpeggiator. On the downside, it has a fragile mylar front panel, very limited programability and a weird feature that autotunes the keys to play weird intervals.
The Bass synth section is monophonic and can be programmed to occupy the lower two octaves of the Quadra's 5-octave 61-note keyboard. The bass sounds pretty good and has 16' and 8' presets each for Electric and String Bass sections.
The string section is based on the Omni II String synth. It sounds excellent and implements a phase-shift effect that is sort-of like a chorusing effect that thickens its already great string sound. In Polyphonic synth mode there are more effects available such as sample-n-hold and the phase-shifter. String and Poly Synth sections have 8' and 4' Polyphonic Waveform Generators each along with a preset called Hollow Waveform.
In Lead synth mode the Quadra becomes a two voice screamer with aftertouch sensitivity in the upper octaves of the keyboard! It's duophonic (like the Odyssey). Get a bass sequence going, switch over to another section and play along! The Quadra is a synthesizer well suited to live performance use. The 8048 microcomputer and 128k of CMOS SRAM memory recalls 16 stored sets of on/off decisions about which waveforms and modulations are turned on in each of the four sections, and lead intervals. Using LEDs the player is visually directed to the sliders critical to the sound selected but their settings are not updated. This necessary tweaking and fine tuning is the weakness of the Quadra.
|Bass synth (Mono), Poly synth, Lead synth (Duo), and String synth (Poly)
|Model 4075 4-pole, 24dB/oct VCF (different parameters for each mode)
|One ADSR VCA
|3 swithes, 3 pedals
|Yes (upper part)
|Outputs for each section
|ARP's system interface
|1978 - 1981
|Y: Yes, N: No, N/A: Not Applicable
|Voltage Controlled Oscillator
|Digital Controlled Oscillator
|Low Frequency Oscillator
|Voltage Controlled Filter
|Voltage Controlled Amplifier
|As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key.
|Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.
|Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.