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Hi Kevin,

I won't say that you *can't* get an OB-Xa sound on a DX7, but it's definitely a 'walking against the wind' task!? The OB-Xa is an analog subtractive synth, a la Moog Arp, Prophet, etc. EVH used a pair of sawtooth or maybe mid-width pulse waves and some detuning.? One can simulate this with an FM synth, but the end result is far from perfect, IMHO.? It's definitely outside the 'sweet spot' for FM synthesis.? (Think:? snappy basses, realistic brass, and shimmering bells.)

The Jump! sound is easy to create on just about any analog or virtual analog poly synth around:? Dave Smith, Roland, Korg, Behringer, Arturia, even a Nord Electro or Stage.? But not so much on a DX7.

OTOH, it will still probably be better than an SK1, if that's your only alternative!

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The general rules for analog waves on an FM synth are:

Wave???????? Op1 (Carrier) ??? Op2 (Modulator)

Sawtooth???? 1.00x???????????? 1.00x
Square?????? 1.00x???????????? 2.00x
Wide Pulse?? 1.00x???????????? 3.00x
Thin Pulse?? 1.00x???????????? 4.00x or 5.00x

Go easy on the amount of the modulation.? A little extra modulation from a third operator at the start of the wave may help to add grit; it should have a very short envelope.? Use an algorithm like #3 or , #4.? Start with the 2nd chain muted, and get a saw wave sound that you are happy with on the first three operators.? Then duplicate that sound on the second three, and use frequency detune to get the proper mix and swirl.

One other thing:? FM synthesis tends to be a bit more 'cold' and sterile than analog synths.? Players sometimes complain about a "lack of bottom end."? I often compensate by adding in some sine wave to fill in the bottom, but one can't layer sounds on the DX7, limiting your options.? You might try getting the base sound with just two operators, using something like Algorithm #5 or #6.? Use operators 1-2 and 3-4 for the sawtooth/pulse sound, then turn off operator 6 and mess around with the level of operator 5 (sine) to fatten the bottom end.

Good luck!