Don't click headphones into the output jack: just barely let the connector fall loosely into the hole and you'll get mono in both sides instead of mono in one ear and silence on the other.
My other synthesizer is a Roland Gaia which is like this but with 3 engines controlled by knobs, actual keys and a bunch of other stuff. I wish I had this device to learn knob twisting synthesis with: this is very basic but powerful. It's a great learning tool.
The built in speaker sounds horrible compared to the output jack/line out. Through the speaker this was a funny toy that got irritating fast, the output from the line out is making me order another one as a keeper (first one was going to be a gift but I really want to play with it a lot more).
I hooked a guitar to the line in and heard nothing. I used an overdrive pedal to get more gain and could hear it coming through but the only knob that seem to have an effect was the cutoff, but that was before I used headphones/amp.
I hooked a mono (one black stripe on the connector jack) cord to go from output on this unit to a guitar amp: awesome but loud. There is no volume control but headphone volume on a pair of huge AKG 240 gold dots and a small cheap pair of Panasonics were good (unlike the much pricier Roland which needs the volume set to 10 to be heard-i hook that to speakers and amp).
Put the stylus metal point facing right. Slide it in from left going right, remove by sliding it left. I know it's silly: but if you try to take it out like a normal person you may break the retaining clip.
Feel: knobs feel cheap but work. Whole unit feels like it weighs less than a single AA battery. Cheap plastic feel: but it's cheap in price and helps you learn synthesis by twisting knobs--not scrolling through boring computer menus. That's also why I like the Roland Gaia, so if you fall in love with the knob twisting simplicity and want more power move up from this to the Gaia (although it costs literally 30 times more, so is apples and oranges past a certain basic point).
Check out YouTube for weird mods/circuit bending stuff people are doing with these things. Some people are installing strips on similar instruments that are a foot long and making guitar-like things. All sorts of fun weirdness.
Is this musical? Through the speaker: not really. Through line out: very much so. You can select a square or triangular wave and modify them.
Set all the knobs to zero except the "cutoff" which you should turn all the way up. This gets you a pure tone. Pitch env, LFO rate and LFO depth are next: play around.
Don't just tap, press and hold and sometimes you can get a weird feedback that totally makes random noise after a few seconds.
Attack and decay affect the beginning of the signal and the end: so for those tap, then adjust and tap again. Hold and heard the difference at the end that the new decay setting makes. The other knobs are more immediate in results. Some adjustments only affect the start of the sound when you first tap (attack).
I swear the vcf button acts like it's pressure sensitive?
Sometimes switching between the two different LFO waves makes no difference, sometimes it makes a wild change.
You can make tones or complex signals that change and evolve over time (if you press and hold a note).
And you probably thought this was just a simple noise maker (:
It's also great for cheaply and easily creating beautiful Lissajou Figures on oscilloscopes:
http://michaellogusz.blogspot.com/2015/07/making-waves-oscilloscopes-lissajous.html
-mike from Detroit
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This Item  Gakken SX-150 MARK II Analog Synthesizer |  |  |  |  |  | |
| Price | — | $199.99 | -20% $1,999.00 List: $2,499.00 | $199.99 | $499.00 | $499.00 |
| Delivery | — | Get it as soon as Wednesday, May 15 | — | Get it as soon as Monday, May 13 | Get it as soon as Wednesday, May 15 | Get it as soon as Tuesday, May 14 |
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| Sold By | — | Amazon.com | Austin Bazaar | Amazon.com | Instrumentpro | Instrumentpro |
| weight | 0.66 pounds | 1.28 pounds | 19 kilograms | 1 pounds | — | 6.29 grams |
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Rainsbury
but its the most sonic fun in you fist that you are going to get ...
Reviewed in the United Kingdom on March 24, 2015