New 2500 user: question about JJ XL memory usage, and invert

Hi, I just got a 2500 and for the first few days just messed around with the Akai OS. I love it, it was easy to get the hang of and start sampling my sounds and making a bunch of beats quickly. This morning I installed JJS OS XL. It immediately solved my main gripe with the Akai OS - sample editing and naming.

When I go into the load screen, it tells me that I have 3.5MB of RAM available for samples, and 4.5 available for sequences. I have the 16MB RAM module installed right now, so I guess that means that JJ OS uses about 8MB of RAM. Is that accurate? I'm trying to figure out if that's JJ OS's footprint, or if some other stuff is loaded into memory that I don't know about. But from what I can tell, JJ OS eats up 8MB. Can anyone here confirm? I have a 128MB card on the way so it won't be an issue next week...I'm just curious though.

Also, is there a feature / trick for inverting a waveform? I've got a few drum samples that I want to layer, but they are phase-canceling because one of the waves starts off on a negative cycle and the other one starts off on a positive one. I just need to invert the phase of one so that they don't cancel. Can I do this right in the MPC somehow? Or would I need to connect the MPC to my computer via USB, and use a computer-based sample editor to invert the waveform?

Thanks for any help.

padillac wrote:Hi, I just got a 2500 and for the first few days just messed around with the Akai OS. I love it, it was easy to get the hang of and start sampling my sounds and making a bunch of beats quickly. This morning I installed JJS OS XL. It immediately solved my main gripe with the Akai OS - sample editing and naming.

When I go into the load screen, it tells me that I have 3.5MB of RAM available for samples, and 4.5 available for sequences. I have the 16MB RAM module installed right now, so I guess that means that JJ OS uses about 8MB of RAM. Is that accurate? I'm trying to figure out if that's JJ OS's footprint, or if some other stuff is loaded into memory that I don't know about. But from what I can tell, JJ OS eats up 8MB. Can anyone here confirm? I have a 128MB card on the way so it won't be an issue next week...I'm just curious though.

Also, is there a feature / trick for inverting a waveform? I've got a few drum samples that I want to layer, but they are phase-canceling because one of the waves starts off on a negative cycle and the other one starts off on a positive one. I just need to invert the phase of one so that they don't cancel. Can I do this right in the MPC somehow? Or would I need to connect the MPC to my computer via USB, and use a computer-based sample editor to invert the waveform?

Thanks for any help.

I dunno about the memory, I'm on the 128mb card. Even without the OS seeming to take up excessive amounts of RAM, 16mb is still much to little to actually do anything substantial.

As for the phase inverted thing, nope, no invert function yet. (would be useful though).
Can't you just trim it to give it the half-wave phase offset? Half a wavelength is probably not gonna do much to the sound.

If you search I and others before me have already requested a invert waveform. I do not know if it is a going to happen though, and so I am making my own invert phase box. nearly finished it to.
Go get the 256 MB stick of RAM - see sticky on top of MPC1000 or MPC2500 section.
Even second hand RAM is good as long as it passes RAM test. see sticky

Thanks for the info. sciguy, do you have a 128MB card, or a 256MB card that provides 128MB as bliprock pointed out? I ordered a 128MB card but now wish I had read the that post first...

THe CF card and RAM are two separate things. You will need RAM upgrade, and probably need a CF card to. Hard drive is another option. see manual and sticky bout that.

yah I got a 2GB CF card from amazon, and a 128MB RAM stick off ebay. The 128MB RAM is actually a 256MB stick that shows up as 128MB in the MPC per the readme info...so basically I'm all set!

Yeah about invert wave form! Yeah it seems very silly to have to export a wave and then re-import it just to do such a simple operation that the MPC is capable of, though just not written in yet.
also consider a mixer, as a lot of them have invert in the channle strip. That would be quicker IMHO that exporting over USB. This is my approach anyways. Or you can also make a phase invert box, but you gotta make it from unbalalnced to balanced signal to invert first.

INVERT was just added to jjos128xl.

Nym wrote:INVERT was just added to jjos128xl.

dammit... Hope it won't be a 128xl-exclusive feature.

Nym wrote:INVERT was just added to jjos128xl.

AND?!?!?!? come on Nym, what does this mean? I know it means it is in JJOS128XL, but is this a indication of what we can expect in JJOSXL? I know your not trolling me, but still a bit more info will help, than just "it is in 128xl".
Like hello?? Please tell us if it is being considered for XL, or is it just gonna be 128xl? half of me is thinking yay, its coming soon, the other half thinks it will not. So I am not any clearer at all, if anything I confused. Thanks in advance Nym.

haha I don't hold back...I don't know is it is going into 2xl or not...I'm not privy to those details or decisions.

Thanks nym

padillac wrote:When I go into the load screen, it tells me that I have 3.5MB of RAM available for samples, and 4.5 available for sequences. I have the 16MB RAM module installed right now, so I guess that means that JJ OS uses about 8MB of RAM. Is that accurate? I'm trying to figure out if that's JJ OS's footprint, or if some other stuff is loaded into memory that I don't know about. But from what I can tell, JJ OS eats up 8MB. Can anyone here confirm? I have a 128MB card on the way so it won't be an issue next week...I'm just curious though.

Make sure that you don't have Autoload set to load the stock sounds that are loaded into the flash memory (I think it's saved in flash memory). That may be what is taking up your RAM.

sciguy wrote:16mb is still much to little to actually do anything substantial.

This is not true. 16 MB is plenty memory to make something. More than enough actually.