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"The operating system also had some bugs and annoying features"
Words such as the 'annoying' concern me as they are derived from the opinion of the author and are not based on encyclopedic fact, I have added the POV banner to this page for this reason; and for other POV points within the article (one of which I have already removed).
Additionally, I do not believe the "Upgrade from MC-505" section is needed either - but others may not agree.
I have doubts about the list of bugs described as still existing after OS 1.23; in fact, I do have the SMF loading issue, but absolutely none of the others. There are project shortcomings rather than bugs at this stage.
I propose merging the two "bugs" paragraphs into a single, shorter one.
The Roland MC-909 is no more built by Roland Corporation (it was entirely built by a small team of enthusiasts people, at the end of 2005, they were laid off by Hewlett Packard).