Re: [LMMS-devel] Fwd: Re: LB302 accent

[Raine M. E. <ra...@ik...>]

Citerar Vesa <di...@nb...>:

> On 06/18/2014 09:48 AM, Raine M. Ekman wrote:
>> Citerar Vesa <di...@nb...>:
>>> In the original TB-303, it wasn't, it was a simple on/off switch.
>> Yes and no. It had a simple on/off switch for programming the note,
>> and a knob for how strong the accent actually is when played.
>>
> Oh, my mistake. I always thought it was just a switch (never had a
> chance to play with a real one myself).

The closest I've come was ReBirth. Nice sound, but it was a great  
example of how a UI copied off hardware can suck in a computer :)


> Got any other info on the accent feature? From what I've been able to
> gather (correct me if I'm wrong), it worked by adding a slight volume
> envelope on top of the note volume, and by modifying both the env mod
> and cutoff of the filter (higher env mod + lower cutoff, so that the
> sweep travels a longer distance). I've no idea about the specific values
> though... I figured I could just guesstimate them, but it would be nice
> if you had a source for some more accurate values.

No, I don't really know anything about the details on this, and your  
impression sounds plausible. But I guess there should be a lot of info  
out there, as the machine is legendary enough that some electronics  
geek must've traced through the schematics and simulated everything,  
or done some heavy measuring.


> Another thing: how should the "dead" switch work with accent? I'm
> thinking the "dead" switch would disable the filter part of the accent,
> and only keep the volume accentuation, unless there's a better way...

IMO it's hard to say without hearing both alternatives. Reading the  
code I'm guessing the "dead" swithc turns the volume envelope into a  
flat line, if that is true it would maybe be more logical to keep it  
that way also when accented. But that's just me thinking in a  
primitive "switch goes to circuit" kind of mindset.

-- 
ra...@ik...
softrabbit on #lmms