Is the One Chip MSX a real MSX or not?

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Par Alex

Master (205)

Portrait de Alex

14-02-2007, 21:41


Anway, to check on this functionality: grab Moonblaster orso, make a sound with a long attack and long release, and play some notes with it in a single pattern channel. You'll surely notice the legato effect.

I have tried with SME3, on a PC with openMSX (with turboR configuration), on a real MSX turbo R and on the OCM.

When I use one of the standard sounds, all machines sound more or less the same (it can never be exactly the same due to differences in analoge circuitry; even the various real FM-PAC models sound slightly different from each other and from the MSX turbo R because of this).

However, when I make an extreme sound, with a very slow attack rate, decay rate and release rate, there are larger differences between the three machines. Hard to describe exactly but I'll give it a try; on openMSX and on the MSX turbo R, you can better hear the discrete steps of the volume adjustments during the various phases. On the OCM this seems to go more smoothly, as if more but smaller steps are taken.

However, I have not been able to notice the legato effect on any of the machines. As far as I can judge, the attack of the first note is the same as the attack of the second, third and fourth note. But maybe my musical hearing is not good enough to hear the legato difference.

Note that I played following pattern (in MML notation):
l2crcrcrcr

So each time a note of length 2, followed by a rest of length 2. This makes sure that the OPLL will go through all phases: attack, decay and release (during the rest).
The release rate is more then long enough to have the note still 'on' at the moment that the next one is started.

Ps: All notes where played on the same channel

Par wolf_

Ambassador_ (9918)

Portrait de wolf_

14-02-2007, 21:54

A substantial release time is required. If you use rests then the release can just fade away, and a next note won't be influenced much.

so, instead of such a curve: /^\ rest /^\

what you should get is something like /^-^\ for notes directly after eachother.

Actually try Impaccable, that Impact demo. There's this part on it called Copy is Crime.. there are more, dunno which, it was the part with those pix of flats/buildings etc. that crappy story stuff .. Tongue That part's sound is completely ruined on emulators as the lead/chord instrument is pumping like / / / / /, while the real output should be much more fluid, like /^-^-^-^-^\.

Par wolf_

Ambassador_ (9918)

Portrait de wolf_

14-02-2007, 21:55

The effect is also present on the Yamaha TX81z btw, so it's quite common for FM.

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