Strange behaviour re. modulation OSCs 2,3 and 4
Posted: Fri Jun 07, 2013 6:16 pm
Hello - please could someone tell me what, if anything, I'm doing wrong here.
Start off with an "INIT" patch. So - you get an oscillator and choose a source to modulate it with - e.g. source 1. Set the source as an LFO - let's keep it simple and say LFO1. Have destination as "Off". Set amount to, say, 20%. It can be observed that destination settings "Lin FM" and "Shape" are also now 20%. You can change the amount value for any of those three destination settings - Off, Lin FM and Shape and the other two will also acquire that value. All the time the amount value for destination value "Pitch" will stay at whatever you set it. So if you had it at zero then no matter what you do to the amount values for the OTHER destination settings, it will remain at zero. Well, OK - to be honest that seems a little odd. I would have thought that changing the amount value for one destination setting should only affect that and not the others but perhaps it's the way that it is for a good reason that I don't understand.
However...try this out on any oscillator APART from OSC 1. Start off by setting the destination to "Pitch" and the amount to zero. Now if you change, for example. the destination to "Shape" and set the amount value to 30 you will hear the effect of that - assuming that the oscillator is of a type where the shape parameter is intended to make a difference! Now change the destination back to "Pitch". The amount is still zero - ON THE SCREEN. But you will hear that the pitch is now being modulated. Not quite right then. It isn't being modulated by an amount of 30, you can hear that, so it isn't just following the amount set for the "Shape" destination. It's sounds like an amount of 3 or 4 - something like that. (If you set a much bigger amount for "Shape" then the unwanted pitch modulation will increase, but it will not be anywhere near the :Shape"amount). Well that's not right, is it. Anyway, if you then set the amount back to zero - which means moving the encoder so that the value goes from zero to some other value and then back to zero - then the pitch modulation is gone.Good. Now try setting the destination back to "Shape". It will still read 30 but there's no effect! Change it to 31 and then back to 30 and you have your shape modulation back. Go back to destination "Pitch" and...that pitch modulation is back even though it shouldn't be, as explained above. And so it goes on.
As I say, it doesn't happen on OSC 1 but it does on the others. It's probably me being stupid somehow but, if so, what am I dong wrong? Can anyone help, confirm, advise etc. Thanks very much.
Start off with an "INIT" patch. So - you get an oscillator and choose a source to modulate it with - e.g. source 1. Set the source as an LFO - let's keep it simple and say LFO1. Have destination as "Off". Set amount to, say, 20%. It can be observed that destination settings "Lin FM" and "Shape" are also now 20%. You can change the amount value for any of those three destination settings - Off, Lin FM and Shape and the other two will also acquire that value. All the time the amount value for destination value "Pitch" will stay at whatever you set it. So if you had it at zero then no matter what you do to the amount values for the OTHER destination settings, it will remain at zero. Well, OK - to be honest that seems a little odd. I would have thought that changing the amount value for one destination setting should only affect that and not the others but perhaps it's the way that it is for a good reason that I don't understand.
However...try this out on any oscillator APART from OSC 1. Start off by setting the destination to "Pitch" and the amount to zero. Now if you change, for example. the destination to "Shape" and set the amount value to 30 you will hear the effect of that - assuming that the oscillator is of a type where the shape parameter is intended to make a difference! Now change the destination back to "Pitch". The amount is still zero - ON THE SCREEN. But you will hear that the pitch is now being modulated. Not quite right then. It isn't being modulated by an amount of 30, you can hear that, so it isn't just following the amount set for the "Shape" destination. It's sounds like an amount of 3 or 4 - something like that. (If you set a much bigger amount for "Shape" then the unwanted pitch modulation will increase, but it will not be anywhere near the :Shape"amount). Well that's not right, is it. Anyway, if you then set the amount back to zero - which means moving the encoder so that the value goes from zero to some other value and then back to zero - then the pitch modulation is gone.Good. Now try setting the destination back to "Shape". It will still read 30 but there's no effect! Change it to 31 and then back to 30 and you have your shape modulation back. Go back to destination "Pitch" and...that pitch modulation is back even though it shouldn't be, as explained above. And so it goes on.
As I say, it doesn't happen on OSC 1 but it does on the others. It's probably me being stupid somehow but, if so, what am I dong wrong? Can anyone help, confirm, advise etc. Thanks very much.