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Dating from the very end of the 70s, the EKO P15 is a rare and quirky Italian analogue which blurs the line between a preset machine and a properly controllable synthesiser. It has 15 pushbutton presets (hence 'P15'), but these are joined by LFO, VCF and VCA sections with much more promising-looking sliders and switches. In practice, the LFO is always freely tweakable, while the VCF and VCA can be switched between Preset mode (in which case they don't respond, because behind the scenes their settings are being determined by the Preset you've currently called up) and Manual mode (in which case you can adjust them to taste).
It's a rather fun system, and while there are obvious limitations – only Attack and Release on the envelopes, for a start – it can be a quick and effective way to get at basic sounds. It's also a laugh to see just how unlike their namesakes the Presets sound: Panpipes is particularly un-panpipe-like.
With both VCF and VCA switched to Manual, the P15 effectively becomes a rudimentary synthesiser with its oscillator type determined by whichever Preset you engage. These 'raw' oscillators range from crusty-sounding ramp waveforms (on the Reed and Violin presets, for example) to various flavours of pulse wave; there's an effective sonic palette available in those oddly-coloured little buttons. The overall impression is, to our ears, one of low-budget 1970s sci-fi shows: full of portentous filtersweeps and LFOs that wobble in time with the cardboard sets. It's kind of cool :-)
There's a three-and-a-half octave keyboard built into a sturdy tolex-covered carrying case, some really lurid green silkscreening (which I'm afraid we've imitated... just couldn't stop ourselves) and, rather optimistically, a legend that reads 'Digital System' in the upper left of the panel... which is just a big fat lie, really, since the whole keyboard is analogue from start to finish, even if it does use newfangled ICs instead of transistors.
We've kept very true to the original in our recreation of the P15, and so long as you keep the Presets Active button engaged and the polyphony switched to Mono, it'll sound and behave just like the real deal. But we made two big improvements that really broaden its capabilities beyond the original's limits.
The first of these is polyphony, which is now a button-press away: suddenly all those presets can be playing chords, which is rather glorious, especially since the analogue impurities and uncertainties stack up and add some warmth. The second is that, if you turn the 'Preset Active' button off, you can now not only tweak the various sliders, you can also engage multiple waveforms (by clicking on several Preset buttons), which thickens the sound dramatically. It's easy using this to dial up a full string section (instead of having to choose between Violin, Viola and Contrabass), or add some Trombones to some Horns for a nice brass pad, and then adjust the envelopes and filter settings for the whole batch of waves en masse. In fact, suddenly the P15 seems to come to life, with a quirky and pleasant vintage character all of its own.
Its typical sound is quite rounded and mellow, with a smoothness we've come to associate with Italian synths and string machines, but cranking up the resonance adds some bite and, just for fun, we've added in a Drive knob on the front panel to push the sound a little harder. You can leave this bypassed for an authentically vintage tone, or add some extra harmonics if you want to make things edgier.
Round the back, of course, there's a batch of effects comprising Chorus, Phaser, Reverb, Echo and an Amp Cab simulator, so you can get the P15 to sound swooshy, swirly, echoey or raw.
All in all, this unusual and hard-to-find little synth really comes into its own when played polyphonically, especially with a whole fistful of Presets engaged at once. In fact, whole worlds of low-budget 70s science fiction are yours to command, and more besides. With the vintage authenticity switched off you can get surprisingly lush textures out of it by combining waves – stuff that really would have seemed cutting edge back in the 70s. All this, and Italian styling too...! What's not to love?