Synth Site: Yamaha: RX-21: User reviews Add review
Average rating: 2.9 out of 5
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dabluz a part-time user from Quebec writes:
I paid about 15 dollars for my RX 21. Actually I have the RX 21L (latin version). Sounds great through a big amp and large speakers. Great learning tool. Lots of fun adding sounds while gigging. A lot cheaper than hiring someone to play congas etc. For the sound, price, simplicity, relability....I give it a 5.

Rating: 5 out of 5 posted Sunday-Jul-10-2005 at 22:05
Algorithm18 a part-time user from Japan writes:
I guess if I paid tons of money for one, I would be kind of pissed, but I didn't, so I love it! I can't believe somebody called the sounds clean! They're pretty lofi and chunky. The cymbals remind me more of hitting a frying pan than a drum kit, but thats part of it's charm. And if you play it through an amp, that kick sounds really punchy. I like the over all sound of this machine, and it's great for layering with other stuff. I like to slave it to a Korg ER-1, and it provides a bit of click to the mid range, and the Korg fills in the booming sounds and synth blips. Perfect combo for electro. As for it only having 2 outputs, all you have to do is sync it with a couple more cheap drum boxes and then you have 6 outputs! Seems pretty obvious... Even if you don't enjoy the sounds, the interface is very easy to use, with a nice graphic display for step editing so you can use it's MIDI out to trigger a sampler or something. Yeah, a nice old drum machine with vintage sounds and a decent interface, which also fits beautifuly atop a TX7 or QX20. If you get tired of it you can circuit bend it without much concern for whether it dies or not. Buy one for cheap and don't complain, you whore.

Rating: 4 out of 5 posted Saturday-Sep-18-2004 at 09:21
dj schiesskopf writes:
You probably won't be able to add independent outs- to be able to do that, each channel would have to have its own DAC (in 80's drum machines anyway, more recent stuff would have a single DAC with a demultiplexer)- that's an expensive way to build things so manufacturers generally took the extra step to add independent outputs. The TR-707, RX11, and DMX are examples of this, the RX21 is much cheaper so I doubt it's possible.

The DACs Yamaha used are probably either Y3014B (one per channel) or Y3012 (stereo output). If you find a bunch of these then you're in business. If not, circuit bend to your liking but you're not going to get individual outputs.

And for an adapter, it probably indicates the polarity so just use anything 9-12V with the correct polarity, 500mA should be more than enough current, if the adapter gets hot then use a higher current one.

Rating: 0 out of 5 posted Friday-Sep-03-2004 at 14:01
ezra a hobbyist user from bushwick writes:
my neighbor just gave me one of these along with two Univox EC-80s(no tape of course :< ) not the most intuitive mrhythm box out there, but its simplicity makes for ease of use. the analogy i would use is TR-707 with anorexia and a learning disability... which is a highly underrated sound. with a little bit(and especially a lot) of processing this thing can be useful. i've found it fun for layering with breaks, pitch shifting, and delay rattle temper tantrums. haven't looked under the hood yet, but my money isn't on it being very modifiable, it seems pretty cheap-digital(probly like 3 ICs on the board or something); i do want to try to give it multi outs as mentioned above. it's busted and the power cord is a faulty cheap replacement; the AC adapter jack says "9-12 V" which isn't very helpful. could anyone in the know provide the correct voltage and amperage required of a proper AC adapter for this thing? anyway, bigup to the bad drums massive

Rating: 3 out of 5 posted Wednesday-Sep-01-2004 at 00:08
2wm a hobbyist user writes:
i'm sure, that like many drum machines with only stereo ouput, that you can find the signals from someplace on the board and bypass the final mixing stage by sending the signal to an alternate output jack. i'm also sure that you could tweak the sounds by playing around with the board. of course this is all related to circuit bending which requires a little more creativity than simply spending way too much money for a piece of equipment because dj schiesskopf used it in one long, boring, repetitive deep house track put out by an obscure label in portugal. get a soldering iron, a multimeter and tear it apart. if it's crummy, what's the harm? beats whining like a baby about it.

Rating: 5 out of 5 posted Wednesday-Aug-13-2003 at 03:08
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