Roland D50 (Part 1)
Linear Arithmetic Synthesiser
Is this the synth to topple the DX7 from its throne? Will Linear/Arithmetic Synthesis become the programmer's new catchphrase? Will Simon Trask die of a broken heart? Find out in our exclusive review.
Few instruments cause as much stir in the MT office as this: a synth that sounds brilliant, looks relatively easy to program, and doesn't cost a fortune. Superlatives are not enough.
BUT WHAT IS this Linear Arithmetic Synthesis, and do you need a PhD in Mathematics to understand it? Well, if you were designing the D50 you probably would, but fortunately, all you have to do is play it and program it.
The programming system which Roland have devised isn't the easiest to understand initially, but if you stay cool, most of it clicks into place without too much brain-ache. And in true Roland fashion, there's an add-on programmer which allows you to adjust all the D50's sound parameters using analogue sliders. The PG1000 (for so it is called) is the most sophisticated programmer that Roland have yet come up with, which seems reasonable enough for what is really the most sophisticated instrument they've yet come up with.
ROLAND HAVE PROVIDED seven Structures which determine whether each partial is a PCM sound source or a synthesiser sound source (this setting is one of the Common parameters). These structures are printed in graphic form on the D50's front panel - providing an invaluable amount of feedback when you're trying to Figure out what the hell's going on. Essentially you can have sample + sample, sample + synth and synth + synth. But you can also choose structures which bring in ring modulation (digitally implemented, of course).
The synthesiser section allows you to choose between sawtooth and square waveforms (the latter with adjustable pulse width). The synthesiser sound generator has three sections: WG (Waveform Generator), TVF (Time Variant Filter) and TVA (Time Variant Amplifier), while the PCM sound generator misses out the filter section. There are also three LFOs and a five-stage pitch envelope which can be applied to various parameters of each generator.
The "Time Variant" label is cleverspeak for envelope - filter and amplitude respectively. As with the pitch envelope, these are five-stage affairs, with level and time settings. The filter envelope allows you to select the filter cutoff point for a synthesiser sound dynamically - not that common a feature. And remember that these envelopes (which are adjustable in real-time) are digitally defined - which makes the D50's filtering a great improvement on the digital filtering found on, say, Roland's S10 sampler.
Carrying on up the hierarchy, two tones can be combined into a single Patch, of which there are 64 onboard the D50 (organised in Bank/Number format). A further 64 patches can be stored on one of Roland's new wafer-thin memory cards (like credit cards, but cheaper in the long run), giving instant access to 128 patches at any one time. The D50 comes with a ROM card which duplicates the factory set of internal patches (so you can overwrite the latter without fear of losing them), but you'll also be able to get RAM cards, and it seems likely Roland will be supporting the D50 with a sound library.
INTEGRAL TO THE D50 are onboard programmable digital reverb, chorus and EQ. As Roland are keen to point out, all processing on the D50 takes place in the digital domain. The reverb is patch-programmable, while chorus and EQ may be programmed for each partial within a patch. The D50 has four output modes (again represented graphically on the synth's front panel) which determine whether the programmed reverb effect is applied to a mix of upper and lower tones, upper and lower tones individually, the upper tone only or the lower tone only. Output mode is programmable for each patch, as are the balance of "dry" and reverb signal, and the choice of reverb type - and that's about the extent of the control you have over reverb on the D50. There are 32 reverb types, providing rooms, halls, chapels, boxes, single delays and cross delays, gates, caves, gated reverb, reverse gate, slapback and twisted space(!).
Another patch-specific feature implemented in software on the D50 is Chase Play. This replays notes that you have just played to give a DDL-type effect according to level and time settings. If you're familiar with the Roland JX10 synth (reviewed E&MM June '86), you'll no doubt be familiar with Chase Play. It's a very effective feature, and a dedicated front-panel button allows it to be switched in and out with ease.
IF YOUR LOCAL music shop salesman starts talking about the LA sound, you'll know now that he's not referring to the latest American West Coast craze. But the D50 does have a sound- and ultimately it will sit next to other synths with other sounds. We racked it up with the DX7II, and a wonderful combination they made, too. As we said at the start, the D50 excels at lending sparkle (thanks to the PCM samples) to warm synth sounds that have plenty of movement.
From the factory programs, those with the greatest impact are "breathy" sounds, strings sounds, and special-effects voices with complex envelope settings. But the existing piano and brass sounds are not the D50's forte, and there's nothing to compare with the best acoustic guitar sound on the DX7II, for example.
But the D50 is an exceptionally impressive and intriguing machine which looks capable, perhaps more than any instrument since the original DX7, of bringing a new quality to sound synthesis. Next month, we'll go in the deep end.
Prices D50 £1445; PG1000 £320, both RRPs including VAT
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Review by Simon Trask
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