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Pro A5 is out!

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Comments

  • maxxpower18maxxpower18

    For someone who doesn't know much, what's the main difference between the oscillators and filter between the Prophet 5 and the Jupiter 8?

  • DMfanDMfan
    edited 5:38AM

    @wim said:
    Not exactly sarcasm @hes. More like (attempted) light hearted irony, but with a tiny bit of truth tucked away in it.

    I mean, if someone sets out for nostalgic purposes to make a lovingly accurate representation of something idiosyncratic, there's nothing wrong with that. If someone sets out to make a recreation inspired by an original, but improving on the original's shortcomings, that's great too. We're all free to like or dislike the results for our own reasons.

    Well put. And constructive feedback regarding whatever always lands a lot better if delivered in a respectful, calm and nice manner, This ”tone” is something this forum is well-known for online. Let’s all try to keep it that way, shall we?

    +1

    /DMfan🇸🇪

  • dendydendy
    edited 6:03AM

    @hes
    Doesn't the Pro A5 also add option of a "modern smooth filter"

    well, regarding that.. there is a bit of misunderstanding / misscommunicstion about “modern smooth filter” on on Pro-x serie.. here is how it really works:

    • Rev1 and 2 - original first versions.. Dirty sounding resonance due to low quality chip SSM2040, unstable oscillstors, vca .. Filter with high resonance very noticeably drives signal.

    • Then Rev3: they swapped filter chip to CEM3320 (used also in Oberheim OB-X, Xa, Elka Synthex, LinnDrum - Check iOS plugin OB-Xd it has very great. emulation of this filter circuit), additionally Rev3 swapped to Curtis chils also for oscillstors, envelopes, VCAs - that’s why it has much more clean and stable sound than rev1/2. The “sound of Pro-5” which most people like and reffer to is in most cases sound of rev3).

    The. in 2020 was made rev4 (“modern”) - this one used same chip as rev3 but additionally they added also SSI2140 (modern clone of SSM2040) and introduced knob “Vintage” - this is crucial knib, what it does:

    • it sweeps filter between more clean CEM and dirty “oldschool” sounding SSI214..
    • additionaly this knob introduces random instabilities to oscillstors tunnings, cutoff value, envelopes times and VCA volume - adding “drift” and old unstable detuned analog vibe.

    So faithful emulation should actually implement both dirty and clean filters and then allow to sweep between them. Note that both are stepping (this detail I did not know before), It’s just unclear if they are stepping same way cause in rev3 they changed also ASC/DCA circuits responsible for scanning Curoff knob (which is source of that stepping, cause Pro5 is digitally controlled synth) - new circuits with better precision means in theory less noticeable stepping but there is no reliable source on internet and there is not much people having both rev1/2 and 3 or 4 to compare that :-)

  • MadGavMadGav

    @maxxpower18 said:
    For someone who doesn't know much, what's the main difference between the oscillators and filter between the Prophet 5 and the Jupiter 8?

    In the originals there are both circuit and feature differences, I’ll try to contrast from memory…

    Prophet 5 rev 1/2 use SSM chips for VCO and VCF, Dave Rossom of E-mu was involved in the design btw. These models have a reputation for unreliability, but good sound.

    Prophet 5 rev 2 then swaps to CEM chips, the 3310 VCO and 3320 VCF. My experience with 3310 VCO (Pro One, SH101) is that it’s a “hard” sounding VCO not “warm” or “goo-ey”. The 3320 as implemented in Pro One is lightly driven so clean and self-resonance is loud vs oscillators - Pro A5 does seem to replicate this gain structure, practically means tweaking resonance to sit right around the point of self-resonance is helpful.

    Jupiter 8 has discrete VCOs (predict warmer) and filter based on IR3109 OTA chip. As far as I know the filter implementation is tamer than the SH101 and does also have a 2-pole mode. The SH101 btw has VCF drive right in the sweet spot of lively resonance with VCO fader up, my Pro One couldn’t drive that hard. My thought is that Roland tuned the Jupiter 8 for “nice” which is something of an advantage for polyphonic playing where “monosynth-wild” would not sit.

    And for comparison: Jupiter 6 switches to CEM 3310 VCOs and different 2 x SVF filter topology, from what I’ve heard on recordings it is quite the “hard” sounding poly. MKS80 then keeps the CEM oscs but back to a more JP8 filter design (4-pole only?) though later models switch filter chips.

    Hope this is helpful background!

  • cyberheatercyberheater

    Amazing explanation MadGav

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