The Official Sequential/Oberheim Forum
SEQUENTIAL/DSI => Prophet => Prophet Rev2 => Topic started by: Razmo on November 16, 2017, 01:39:59 AM
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I know that there has been some problems with the LFO as I can see that in another thread in here that is now locked... I'm on the latest OS, but the LFO still behave strangely when pressing certain keys... it does not matter what shape or frequency you choose for the LFO... at some keys, the LFO shape "breaks up"... you can hear it when you set the LFO frequency very slow... then suddenly there is a short duration in the modulation where all sound simply disappears for a brief period... it happens with all shapes, all frequencies and no matter if the key sync is on, or the clock sync...
The behavior starts with values 81 and above for the Triangle shape, and all other shapes it start with values 41 and above.
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Here is how to recreate the bug:
1. press Transpose Down/Up and Hold button to initialize a program.
2. Set LFO1 destination to Osc1 Freq
3. Set LFO1 Amount to max
4. Set LFO1 Frequency to 58
5. Play the upper last octave of the REV2 keyboard
somewhere in the middle of this octave you'll start to hear the LFO acting strangely... it happens with all the waveshapes, and at any rate setting... at lower rates you can easily hear what is going on... the amount has to be quite high before it starts to break up, and the amount for that will depend on the waveshape you choose, but all of the waveshapes does this.
Another thing worth noticing is that the keys at which it happens seems to shift a bit... when you play over the bad keys, some of them start to sound right, then other go bad, and back again.
A really weird behavior, and certainly it must be a bug... can others reproduce this?
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At first I was going to suggest a calibration routine since it was recommended on the latest OS version, but I tried following your step by step process and it turns out that you are right.
The sound cuts on some notes in the upper range. I notice it on 4 following notes (F, F#, G, G#).
It doesn’t sound like the LFO distorsion we experienced before the beta update. It seems like when the pitch goes under a certain value, the sound cuts and comes back when the value is then passed on the other side of the periodic curve.
Just to clarify, I run the latest beta update 1.1.0.1 and I have performed a calibration yesterday evening before trying out the step process.
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At first I was going to suggest a calibration routine since it was recommended on the latest OS version, but I tried following your step by step process and it turns out that you are right.
The sound cuts on some notes in the upper range. I notice it on 4 following notes (F, F#, G, G#).
It doesn’t sound like the LFO distorsion we experienced before the beta update. It seems like when the pitch goes under a certain value, the sound cuts and comes back when the value is then passed on the other side of the periodic curve.
Just to clarify, I run the latest beta update 1.1.0.1 and I have performed a calibration yesterday evening before trying out the step process.
And I also just recalibrated before just to be certain... and am also on the 1.1.0.1 OS ... so this is a bug indeed... I have send it to DSI support, I'm waiting for their confirmation response still.
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The sound cuts on some notes in the upper range. I notice it on 4 following notes (F, F#, G, G#).
I can reproduce this for F, F# and G. It begins for F at Amount = 113, for F# at Amount = 97 and for G at Amount = 80.
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Support just wrote to me... they are aware of this bug, and working on it.
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Support just wrote to me... they are aware of this bug, and working on it.
Good to know they are aware of it and working on a fix
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Support just wrote to me... they are aware of this bug, and working on it.
I have noticed the same problem. I hope they can fix this.
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This is resolved in BETA OS 1.1.0.2, available here: http://forum.davesmithinstruments.com/index.php/topic,1531.new.html#new
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That was pretty quick bug fixing. Good job, DSI!
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The LFOs still behave strange... do the following:
1. initialize a program with Transpose/Hold
2. set LFO1 amount to max
3. set LFO1 destination to OSC1 freq
4. set OSC1 frequency to E1
5. set LFO1 frequency to 20
play some keys and hold them to hear... LFO behaves weird on a lot of keys with abrupt changes.
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The LFOs still behave strange... do the following:
What waveform is LFO1 set to after this process? Triangle?
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The LFOs still behave strange... do the following:
What waveform is LFO1 set to after this process? Triangle?
Yes... It is the standard waveform selected when you initialize a program... After initializing, the only controls touched are those that i listed
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Seems to happen for the almost lowest notes, interestingly not for the most lowest ones. I have found something quite similar for the almost highest notes. Support is informed and will have a look at it next week. Maybe the root cause is the same or similar. First let's grant them Thanks Giving... ;)
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Is the beta version still available as I can't see the link to download it anywhere?
Since loading 1.1.0.1 I've noticed F2 P93 seems to behave strange on F,G & A above middle C. If I transpose an octave on the keyboard the problem keys shift to where they are on the transposed keyboard, so it can't be the physical keys themselves.
This was OK before I updated, is my problem with this the same as this thread topic? Do others have the same problem on this preset?
Edit - 30 seconds after posting this I found the link to the beta version!
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Is the beta version still available as I can't see the link to download it anywhere?
Since loading 1.1.0.1 I've noticed F2 P93 seems to behave strange on F,G & A above middle C. If I transpose an octave on the keyboard the problem keys shift to where they are on the transposed keyboard, so it can't be the physical keys themselves.
This was OK before I updated, is my problem with this the same as this thread topic? Do others have the same problem on this preset?
Edit - 30 seconds after posting this I found the link to the beta version!
I've noticed this (since 1.1.0.1) with patches F2 P85, F3 P8, & F3 P43. On one or two notes I get different/random LFO rates, underlying stepping through different notes behind the note played, and completely different underlying sounds from the preset. The latest update (1.1.0.2) didn't fix this issue for me however. I've contact customer support, but so far no luck.
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I can say that support recently told me that the LFO bug will be looked into more... they just could not give a timeframe for it... but at least it's on the bug list, so stay tuned for a fix...
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Additional improvements in BETA OS 1.1.0.3: http://forum.davesmithinstruments.com/index.php/topic,1531.0.html
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The update seems to have fixed the issue I was experiencing. Good job on the speedy fix, DSI!
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Additional improvements in BETA OS 1.1.0.3: http://forum.davesmithinstruments.com/index.php/topic,1531.0.html
I keep seeing "improvements" as the buzzword, but not the one i hoped, which is "fixed" ... Are this bug so comprehensive, that a full fix is not possible? 🙂
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As a person with over 30 years of commercial software development, I would like to say that I've yet to come across anything that could be classed as 'bug free and fixed', it's just the nature of the beast in my opinion :)
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As a person with over 30 years of commercial software development, I would like to say that I've yet to come across anything that could be classed as 'bug free and fixed', it's just the nature of the beast in my opinion :)
Sure... but still DSI use two buzzwords... "fixed" and "improved"... I asume there must be a difference, and I'd like to hear what that difference is :) ... I've been coding since 1980's, so I'm fully aware that there will always be bugs... it just puzzled me, that exactly THIS bug is being "improved on" while all others are being "fixed" :D
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As a person with over 30 years of commercial software development, I would like to say that I've yet to come across anything that could be classed as 'bug free and fixed', it's just the nature of the beast in my opinion :)
Sure... but still DSI use two buzzwords... "fixed" and "improved"... I asume there must be a difference, and I'd like to hear what that difference is :) ... I've been coding since 1980's, so I'm fully aware that there will always be bugs... it just puzzled me, that exactly THIS bug is being "improved on" while all others are being "fixed" :D
:) I see what you mean :)
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As a matter of interest and not related to this thread title, has anyone come across any presets that seem to be silent? I'm sure I have but never made a note of it.
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As a person with over 30 years of commercial software development, I would like to say that I've yet to come across anything that could be classed as 'bug free and fixed', it's just the nature of the beast in my opinion :)
Sure... but still DSI use two buzzwords... "fixed" and "improved"... I asume there must be a difference, and I'd like to hear what that difference is :) ... I've been coding since 1980's, so I'm fully aware that there will always be bugs... it just puzzled me, that exactly THIS bug is being "improved on" while all others are being "fixed" :D
:) I see what you mean :)
I guess it's the drawback of being a coder... you get curious as to what it really is that "was the problem"... information that others would probably rather be without :D ... this LFO bug has had the REV2 act really strange in some cases, which just trigger my curiosity... I would like to know why it's so complicated to fix :) ... but in any case, I'm happy with any improvements as well... of course.
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As a matter of interest and not related to this thread title, has anyone come across any presets that seem to be silent? I'm sure I have but never made a note of it.
I have not... yet, at least.
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I have made a few tests with the LFO's and can positively say, that the strange breakups that was present before this OS update seems to be fixed... I have not encountered any problems as of yet... nice! ... this was the most critical bug still present in my opinion... :)
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I have made a few tests with the LFO's and can positively say, that the strange breakups that was present before this OS update seems to be fixed... I have not encountered any problems as of yet... nice! ... this was the most critical bug still present in my opinion... :)
Excellent news, thanks for the info. I'll load this later today :)
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I must say that, after checking those patches, on my REV2 that strange behavior does not occur and I'm still on version 1.1.0.2 of the firmware. So perhaps it is happening only on some of the REV2s out there ?
We had a similar thing happen with OB6, where a small percentage of owners would experience certain bugs, but not others. But DSI still managed to correct them in the long run.
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As a matter of interest and not related to this thread title, has anyone come across any presets that seem to be silent? I'm sure I have but never made a note of it.
I've not had much time to go through the presets, but so far I've come across this once.