This is a demo of the big brother of the DX7, SY77.
I have the module version TG77, so I will be comparing the DX7 and TG77.
SY77 was released in 1989 and its synthesis called the Realtime Convolution and Modulation.
Basically, it combines Advanced Wave Memory (sampled waveforms) with Advanced FM synthesis
with real time digital filtering.
It is more than the sum of capabilities of Yamaha DX7, Roland D-50 and Korg M1 combined.
We will look at key differences between the Yamaha DX7 and SY77, as well as Roland D-50
and Korg M1.
We will also compare the SY77 factory and original patches with the DX7 original patches.
After the release of the Yamaha DX7 in 1983, within 6 years, Yamaha made a big leap in
advancing FM synthesis.
SY77 not only has 16 bit sampled waveforms, you can use them as a source waveforms for
its FM synthesis.
It's a monster FM synth for sure!
This is a patch that use a sampled waveform as a source of FM synthesis.
So this sampled waveform is frequency modulated, giving a life back to the 'dead' sound!
Although the Roland D-50 allows you to ring modulate 8 bit waveforms, you cannot use its
digital filter for further shaping its sound.
The SY77/ TG77 goes far beyond that, using 16 bit multi sampled waveforms and use them
as AFM source and then you can use that AFM output for a further system wide feedback!!!!!
Then you can use its digital filters to re-shape the sound further.
This is the first Yamaha FM synth with amazing analog-like digital filters.
It has a self-oscillating resonance capability, so when you push to its maximum, it becomes
like an oscillator.
Although the Korg M1 had a digital filter, it doesn't have a resonance capability.
You can use the filter for both sampled waveforms as well as AFM sections.
So for the AFM section, you can treat FM as a harmonic rich waveform source and use the
filters to cut down certain harmonics.
In that case, you don't necessarily need to know FM synthesis.
Here is the digital filter section.
You set the 2 low pass filter with the same setting, so that you can get -24 dB cut off.
You can set resonance, and when you set it higher, it starts to self oscillate.
Its FM section is called AFM.
There are 45 types of algorithm and also it's possible to make your own.
FM input source can be selected from sampled waveforms from AWM or noise, and you can have
a system wide AFM feedback loop.
It's operators now have 2 inputs and 1 output.
Also you have a choice of using a selectable waveform from 16 sine wave variant waveforms.
This means that you can use less number of operators to create complex harmonic tones.
Feedback loop sections can be assignable and you can have 3 feedback operators per algorithm,
it's easier to make some nice sawtooth type pad sounds, as well as analog/ subtractive
synth sounds.
Yes, with the Advanced FM section, you can pretty much create any types of sawtooth waves,
including 'Super Saw' and use its filter to control harmonic contents.
I will give you a quick tour of SY77 sound design.
This is my original patch, OB-Xa.
It only uses 1 AFM, so you get 16 polyphony.
When you go into a Oscillator screen, you will see a selectable waveform for each operator.
At the moment, Operator 1 uses a sine wave, but you have a choice of selecting from 16
waveforms.
There is a dedicated Algorithm screen that shows you how each algorithm is structured.
The algorithm 42 has 3 independent towers, so this is the same as Algorithms 5 & 6 found
in the DX7.
You will notice that there are 2 inputs and 1 output for each operator.
This operator input screen shows you external inputs for all operators.
You can either use noise or sampled waveforms from AWM for further frequency modulation.
For this patch, Noise nor AWM waveforms are used.
This screen shows you how each Feedback loop is used.
There are 3 feedback loops that you can assign to 3 operators of your choice.
In this example, Operators 2, 4 & 6 use Feedback and Input 1 for those 3 operators are used.
Now you can see Input 1 and Input 2 for each operator.
Operators 2, 4 & 6 use Input 1 for Feedback at maximum.
So by using three independent towers, each producing its own sawtooth waves, you can
create a great sawtooth pad using 3 FM sawtooth waves!!!
Envelopes are expanded, having 7 levels and 7 rates, so you can create more complex sounds.
One unique feature is that you can loop your envelope.
That means, you can create FM looped bells, plucked sounds, without using sampled loop
sounds.
With a large screen, now you can see all 6 envelopes for all 6 operators.
This screen shows you Rate of all 6 operators for Key On.
Rate includes Hold Time, R1, R2, R3 and R4.
You can also set keyboard rate scaling.
This screen shows you Level of all 6 operators for Key On.
Level includes L0, L1, L2, L3 and L4.
LP indicates envelope loop point, and you can set it for FM envelope looping.
This is a screen for Key Off envelope parameters.
Key Off Rate includes RR1 and RR2.
Key Off Level includes RL1 and RL2.
Also, you can see a graphical envelope for each operator for both Rate and Level.
Pitch envelope can be assigned as a global or operator specific, allowing it to easily
create analog synth stab brass sounds.
LFOs are also improved.
You can assigned it globally or per operator.
Also it can be applied to its digital filter.
Internal effects are OK, not as good as the bigger brother SY99 which has a built-in Yamaha
SPX-90 class stereo effect unit.
It has some good drum kits, so SY77 or TG77 can be used for just drum sounds.
SY77 has a built in sequencer, so it can be a complete workstation, like the Korg M1.
The TG77 has better audio out (22 bit D/A converters) with 8 individual outputs so it's
a good module for multi-track recording.
SY77/ TG77 polyphony is 16 either single (1 AWM or 1 AFM) or dual (1 AWM + 1 AFM at the
same time).
Yes, you can combine a sampled sound and FM sound at the same time and you still get 16
polyphony.
So the biggest question is, can the DX7 keep up with SY77?
So What's your thought around SY77/ TG77?
If you love 12 bit pure FM sounds, then the DX7 is right for you.
If you want sampled sounds with a powerful FM synth, and having amazingly analog-like
digital filters, then SY77/ TG77 or even SY99 is right for you.
If you can't decide which one you want to have, then why not have both!!



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