The Official Sequential/DSI Forum

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Pro 2 / Re: Additional Feature Request List
« Last post by JRod37 on Today at 03:40:09 PM »
New here, but love the Pro 2 so far! And the Linear FM I see everyone asked for has been implemented and sounds great :-) So far, all I'd be looking for is more and updated wavetables
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Prophet Rev2 / Re: Why do Sequential/DSI synths sound "harsh" to me?
« Last post by guyaguy on Today at 03:31:31 PM »

I recently read a bit from the CEM3396 datasheet, and it actually mention that they created exactly TWO VCA's to circumvent a particular distortion situation if it only had ONE VCA... it was something about the VCA envelope that would get possible distortion, if all volume was to be controlled thru only a single VCA CV... now I'm not sure if this has anything to do with this, but if you experience that this harshness/brightness goes away when lowering the Volume VCA, then it may be that it originate from the VCA curcuit maybe... i do not see how anything should be capable of overdriving the VCA stages, as they are the last in the signal chain inside the chip... the raw oscillators are obviously fed directly into the filter, and from there into the two VCA's after that... maybe it's a combination of the oscillators and the filter with resonance... i read in many Sequential manuals, that you CAN clip the Curtis chip with high resonance... so maybe the VCA's inside the chip can get driven too hard from the filter... or maybe if the output from the filter, when it's too low gets amplified and distorted in the VCA's somewhere? ... in other words, I do not know... but it would be fun to experiment a bit with the signal flow of the Curtis chip some day.

We haven't quite defined the meaning or cause of the "harshness" in this thread, so things are a bit vague.  What I was referring to above was a harshness that was the result of slight distortion.  Because I use layered patches all the time, distortion is a serious and constant problem for me.  High audio levels, distortion, and a fully-open filter are a recipe for musical disaster.  But again, I do think a full open filter can still be made to sound pleasant, rather than harsh.
Thatís why I was asking for a definition of harsh earlier on. One manís harsh is another manís super saw. 

Speaking of saws...I wonder if the perception of harshness would change if the default wave were triangle or square...
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Pro 2 / Re: Other synths through the Pro 2 filters
« Last post by JRod37 on Today at 03:27:58 PM »
I'm a new Pro 2 owner, and part of the selling point was the audio in as I have a P6 desktop that I plan to control with the pro 2, 2 analog osc's with my 4 digital and so far so good! Though it's a shame it's not a stereo input
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Prophet Rev2 / Re: How to make this patche ? Help me please !
« Last post by Ben26 on Today at 02:59:28 PM »
Wow ! Many tanks, i'll follow your advice !
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Sequential Prophet X / Re: Going Out of Tune?
« Last post by mildwest on Today at 02:09:44 PM »
Try running an pitch/mod wheel calibration.

this worked for me. I had that issue. All good now.
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Sequential Prophet X / Re: Prophet X Desktop
« Last post by DMS on Today at 01:59:23 PM »
Guess the problem to fit it in a desktop is that the X uses a standard Mini-ITX PC motherboard which  is not under DSI design +  the SSI 2144 analog board, with the Xilinx Artic 7 FPGA, which connects to the host board isn't small either. Then they need to find space for all the LCD displays, the controller boards and the harddisk. All in all it would be a pretty big undertaking + it would likely become more the size of a Benchtop than a Desktop, perhaps like the form factor of an MPC5000/MPC-X. Very simplified the X is equivalent to an USB based external controller with displays (Push like), a PC running headless Linux and a PCI-e (Thunderbolt) soundcard. Very impressive nevertheless.
http://www.asrock.com/mb/Intel/J3455-ITX/
https://www.youtube.com/watch?v=Q8QDCocnt0M

Thanks for the inside look and tutorial. Iím going to pull mine apart this week. Seems Iíve lost the instrument oled screen, tech support has instructed me to pop the hood and check the ribbon cables
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I recently read a bit from the CEM3396 datasheet, and it actually mention that they created exactly TWO VCA's to circumvent a particular distortion situation if it only had ONE VCA... it was something about the VCA envelope that would get possible distortion, if all volume was to be controlled thru only a single VCA CV... now I'm not sure if this has anything to do with this, but if you experience that this harshness/brightness goes away when lowering the Volume VCA, then it may be that it originate from the VCA curcuit maybe... i do not see how anything should be capable of overdriving the VCA stages, as they are the last in the signal chain inside the chip... the raw oscillators are obviously fed directly into the filter, and from there into the two VCA's after that... maybe it's a combination of the oscillators and the filter with resonance... i read in many Sequential manuals, that you CAN clip the Curtis chip with high resonance... so maybe the VCA's inside the chip can get driven too hard from the filter... or maybe if the output from the filter, when it's too low gets amplified and distorted in the VCA's somewhere? ... in other words, I do not know... but it would be fun to experiment a bit with the signal flow of the Curtis chip some day.

We haven't quite defined the meaning or cause of the "harshness" in this thread, so things are a bit vague.  What I was referring to above was a harshness that was the result of slight distortion.  Because I use layered patches all the time, distortion is a serious and constant problem for me.  High audio levels, distortion, and a fully-open filter are a recipe for musical disaster.  But again, I do think a full open filter can still be made to sound pleasant, rather than harsh.
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Sequential Prophet X / Re: Prophet X Sounds
« Last post by Differencetone on Today at 01:52:07 PM »
For piano, the keyboard just doesn't cut it. It's good for noodling with crazy space sounds. I would not give up the Nord...

The so called 'deep samples' are great. I played a 1928 Grand today, about eight different mic placements.  On par w/ Galaxy Instruments grands.  Very expressive despite the synth weighted keys.

Did you play with a suspend pedal? If so, how was the response, did it feel right? Basically asking to see of the PX could eventually replace my Nord Electro for piano and electric piano sounds..
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Prophet Rev2 / Re: Why do Sequential/DSI synths sound "harsh" to me?
« Last post by Razmo on Today at 01:42:48 PM »
It seems to be the claim here - at least among some - that the only way to avoid harshness in the Prophet '08/Rev2 is to somewhat close the filter.  So, in 4-pole mode, a fully open filter creates an inescapable harshness?  I wouldn't agree with this.  There are ways of keeping a wide-open filter from being overbearing, the two most obvious being to restrain the VCA level and to be wary of resonance.  With some patches, it even makes sense to slightly lower the VCA envelope sustain. 

Yes, at higher amplitudes and with excessive resonance the instrument can sound harsh, but it isn't necessary; nor would I call such harshness a characteristic of the instrument.  It's only a potential.

I recently read a bit from the CEM3396 datasheet, and it actually mention that they created exactly TWO VCA's to circumvent a particular distortion situation if it only had ONE VCA... it was something about the VCA envelope that would get possible distortion, if all volume was to be controlled thru only a single VCA CV... now I'm not sure if this has anything to do with this, but if you experience that this harshness/brightness goes away when lowering the Volume VCA, then it may be that it originate from the VCA curcuit maybe... i do not see how anything should be capable of overdriving the VCA stages, as they are the last in the signal chain inside the chip... the raw oscillators are obviously fed directly into the filter, and from there into the two VCA's after that... maybe it's a combination of the oscillators and the filter with resonance... i read in many Sequential manuals, that you CAN clip the Curtis chip with high resonance... so maybe the VCA's inside the chip can get driven too hard from the filter... or maybe if the output from the filter, when it's too low gets amplified and distorted in the VCA's somewhere? ... in other words, I do not know... but it would be fun to experiment a bit with the signal flow of the Curtis chip some day.
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Prophet Rev2 / Re: Why do Sequential/DSI synths sound "harsh" to me?
« Last post by Razmo on Today at 01:34:55 PM »
Of course I, too, agree with the above. My previous point was not so much about individual taste concerning filters and "good" sound in general though, but more a kind of praise of the Rev2 oscillators and filters "going to 11" (as Razmo mentioned earlier), which opens up for more sound possibilities. Considering it's a subtractive synth, the more starting material to subtract from, the better (generally speaking, of course it depends on the actual material character/quality as well, and the ways and designs to subtract from and modulate it etc etc etc).

Only reason I mentioned my general preference of filter settings on the Rev2 (not every other synth, I may add), was to relate to the main topic of "harshness" in this thread in what way I think the filter could be adding to this effect, and an idea on how to avoid it (since it doesn't seem to be the character that the original poster likes). So, my "opinion" on this was not in any way to suppose what is "good" or "bad", in any way. Did anybody not miss my point?   ;)

My opinion is this is an interesting topic.

Not at all ;) ... I did not even have your comment in my head when I wrote the above... it was just a general statement about the general debate I often see people have, on why this synth is better than that synth... you can certainly debate WHY someone have a bad feeling about a particular synth... I'll even call this thread an ok question... i like these debates if they are constructive, trying to analyze the "problem" etc... and as long as the debating parties have respect and a decent way of going about the debate :) ... on other groups on the net, these kind of debates can quickly turn ugly... for no good reason really...

I actually tried to "hear the harshness" and feel like I "hear it"... with the filter wide open (or rather the range from 128-164)... I heard it in my small demo i made earlier... i too hear this "harshness" from time to time, but i always attributed it to the way the sound was designed, not as a general all-over trait of the Curtis chip... i often lower the filter envelope amount in my sounds, when they seem too bright/Harsh, i just never thought about it as a character of the entire synth... it goes away when the filter is not totally opened...

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