RE: MID/Audio Wish List

Patrick Ozzard-Low wrote:

>Regarding Mr Mickey Mouse: On the Roland, if you want to preserve a
>any kind of realistic quality of timbre the upper limit of
>transposing a sample from its original sampled pitch is about a
>minor third (up), and a major third down - depending on the timbre.
>In my own case, I typically use a sample mapped to no more than about
>150 cents BELOW the original sampled pitch, but very seldom
>transposed upward. This is more than adequate for my purposes
>(local friends think I'm too fussy) and there is no 'mickey mouse'
>effect within these limits.
>
>More correctly, you have limited the transposition artifacts on timbre to an
>acceptable level. They are still there, and the degree will vary with every
>sample's level of formant frequencies.
>
> > >Increasing the number of "Partials" will not solve your problem,
>> >because you'll have a new one -- the sampler's internal RAM will
>> >not have enough storage to handle the increase. Program parameters
>> >are most likely to be stored in 64K to 512K local RAM inside the
>> >unit, not your 32M to 128M sample RAM. If you now ask
>> >manufacturers to increase the local RAM just for microtonal
>> >support, I can tell you that none of them will do it because that
>> >increases the price of the hardware.
>
>Sorry, John, this is wrong. Increasing the number of 'partials' has
>no effect on the used sample RAM on the Roland or AKAI systems.
>
>Patrick, it's obvious you don't understand the difference between internal
>program storage RAM and sample RAM. In fact, your following comments pretty
>much proved what I said was right, that program parameters for "Partials" are
>not stored in sample RAM on Roland samplers. Sample RAM is used to store the
>raw samples. Program RAM is used to store loop points, tuning offsets,
>velocity response, filter parameters, tuning tables, MIDI parameters, etc.
>For a synthesizer, the builtin samples are stored in ROM (Read Only Memory),
>the builtin program parameters are probably stored in the microprocessor code
>ROM, and the user programs (no samples) are stored in battery backed RAM.
>
>More 'partials' does not mean more RAM; on the Roland
>(at least) only samples take up sample RAM.
>
>See my response above.
>
John Loffink
john.loffink@compaq.com

>


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From: "Paul H. Erlich"
Subject: RE: JI approximation to 22ET
PostedDate: 15-01-98 21:47:32
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> The number of steps assigned to all these ratios in both tunings agrees
> with 22TET when displayed on a 7-limit lattice. Right, Manuel?

That's correct. However if the tones of the Kraehenbuehl & Schmidt tuning
are quantized to 22-tET then step 7 (49/40) and 15 (63/40) are off by one
to 6 and 14 resp. If the factors 3, 5, 7 in these ratios are quantized
independently then they agree with step 7 and 15 (which is what Paul
meant).

Manuel Op de Coul coul@ezh.nl


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PostedDate: 16-01-98 15:08:41
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