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When I first heard that Korg were releasing a small handheld portable synth I was very skeptical. It seemed at the time as though Korg were going down the route of 'Musical Toys' as opposed to serious music production tools. However I did decide to buy a Monotron as curiosity got the better of me and for the price it seemed reasonable.
When the Monotron arrived I was not expecting it to be as small as it was (As big as a audio cassette tape). I inserted some batteries and fired it up. The in-built speaker sounded really clear with a good level. Playing with the monotron was fun but the novelty soon wore off. As a music producer myself I just found it to limited. Yes the Korg MS-20 filter is good and very useful but as a serious production tool the Monotron does not cut it.
It should be noted however that the Monotron was designed to be fun, you can combine it with the other products in the range and build up a mini-modular instrument which adds more scope and functionality.
An enjoyable product with little to no longevity.