Do bellows act as a resonance chamber?

[CC_PDX]

modeling also has some natural limitations, like the complexity takes up so much power and ram that only every few note pitches are modeled,and software simply transposes the few pitches in between, which can always be noticed if there are any linear impurities in the waveform (which change their length when transposed and are revealed)

This is something that blows me away about the Modartt modeling I mentioned above--how it is incredibly light on the CPU and RAM (unlike massive sample libraries that are dozens of GB), and it loads presets nearly instantaneously. It is so efficient that I also have it running on a $79 Raspberry Pi 4 GB box though a basic $100 PreSonus audio interface to replace the stock "Supernatural" sounds on my top of the line Roland when I take it out for gigs. I'm effectively using my Roland Digital Stage piano as a midi controller.

 

[Ventura]

very interesting that it is so easy on the resources

i went to the Modartt homepage but couldn't find much
about "How they done it"

yes at 20 to 50 megabytes for their entire loaded program it is certainly trim

the higher quality GM MIDI basic soundsets in wide use for a decade
or so, with enough realism to fool most ears were only 8mb
(i installed the old ensonique developed set/sound card into so many music computers)
so yes, amazing things can be done with a little bit of RAM

but in support of the higher quality for stage use, it was mostly a dream
because of the brute computing power required

for a time, PEAVEY underwrote the development of (Project Morpheus ?)
and even had it on the market as a stand alone and viable alternative
for awhile so you could take your computer sound generating stuff used
in your studio onto the stage

somehow your friends at Modartt have found a solution, apparently,
that satisfies your ear and beats the stock sounds of your Stage Piano

pretty cool

i am also amazed (in this thread) how our Debra has the ear
and discernment to notice the nuance caused by the proximity
of the first bellows fold.. AND THEN figured out a solution

it would still be sprawled out on my workbench 10 years later
with no solution in sight

 

[debra]

...

i am also amazed (in this thread) how our Debra has the ear
and discernment to notice the nuance caused by the proximity
of the first bellows fold.. AND THEN figured out a solution

it would still be sprawled out on my workbench 10 years later
with no solution in sight

I'm less of a genius than you may think. I saw the construction illustrated below, in a Serenellini accordion, and that's where I got the idea that some type of cover of the reeds in cassotto might have a practical purpose. Only, this Serenellini cover was on the wrong side to do what I needed. So a bit of lateral thinking got me going. I suspect that the Serenellini cover has to do with avoiding any influence from the changing distance to the bass blocks as the bellows are opened and closed.


On a different note (not musical) I just had to laugh at the statement "yes at 20 to 50 megabytes for their entire loaded program it is certainly trim" about software... I had to think back at the time when I wrote a control program for model railroads, in which you could enter the layout of the tracks (sections, switches, crossings...), the route you wanted each of up to 30 trains to follow, and then the program would control everything in real time. I had exactly 2Kbyte (not Mbyte, Kbyte) for the whole programm, and 1Kbyte ram as working memory (plus a little bit of stack space)... We have come a very long way (since 1985)...

 

[Tom]

I'm less of a genius than you may think. I saw the construction illustrated below, in a Serenellini accordion, and that's where I got the idea that some type of cover of the reeds in cassotto might have a practical purpose. Only, this Serenellini cover was on the wrong side to do what I needed. So a bit of lateral thinking got me going. I suspect that the Serenellini cover has to do with avoiding any influence from the changing distance to the bass blocks as the bellows are opened and closed.


On a different note (not musical) I just had to laugh at the statement "yes at 20 to 50 megabytes for their entire loaded program it is certainly trim" about software... I had to think back at the time when I wrote a control program for model railroads, in which you could enter the layout of the tracks (sections, switches, crossings...), the route you wanted each of up to 30 trains to follow, and then the program would control everything in real time. I had exactly 2Kbyte (not Mbyte, Kbyte) for the whole programm, and 1Kbyte ram as working memory (plus a little bit of stack space)... We have come a very long way (since 1985)...

Great work Paul. ......at least you didn't have to write your program on punch cards!

 

[debra]

Great work Paul. ......at least you didn't have to write your program on punch cards!

No, I had to enter the whole program on a Hex keyboard (on the Elektor Junior computer).
I did another program on punch cards. It was a stack of cards about 20cm thick and the card reader on the old PDP 11/45 had trouble reading all of them correctly (so it had to be tried a few times before it worked instead choking.

 

[Ventura]

my God i opened that Serenellini photo of yours, Debra, an blew it up
to make sure..

he DOVETAILED the freaking wood where he added the finishing layer under the
reedblock that would mate against the holes in the plate

what a pure Joy it is to look at an accordion and the closer you look
the more quality and attention to detail you find

 

[debra]

my God i opened that Serenellini photo of yours, Debra, an blew it up
to make sure..

he DOVETAILED the freaking wood where he added the finishing layer under the
reedblock that would mate against the holes in the plate

what a pure Joy it is to look at an accordion and the closer you look
the more quality and attention to detail you find

Sorry to burst your bubble of admiration for Serenellini... but I believe that what you saw in the picture was an optical illusion (probably due to the low res picture).
Here is the full size. No dovetail there unless I'm missing something.
I'm hoping the board will take the high res picture.

Edit: as I feared the forum did not take the full res picture. This one is perhaps already enough but for the full res picture, see https://de-bra.nl/photos/accordion-repair-2021/orig/P7192936.jpg

 

[Dingo40]

Actually, I couldn't see the dovetail either!

 

[Ventura]

in the hi res i can see it is just the oak grain making the lines and the lighter coloring
was optics that seemed to outline dovetailing, and it seemed to go symmetrically !

it seemed like a fanatical level of dedication

LoL