When I register now a PC version of renoise, will I pay for eventual Linux/mac version once more - or there will be other renoise ports for free for reg. users ?
Please don’t post double. It won’t get you faster or better answers and is only annoying to other users. (the other post is deleted). Phazze will have to answer this.
sorry Martinal… it was unawares, just a mechanical double click 
I know that 's unpleasant to see double posts, but how to delete it, when it happened ?
moderators can delete duplicate posts. i wouldn’t draw much attention to in if it was an error.
regading your question:
as apple version requires additional effort on our side, additional programmers, additional advertising on different websites and additional other expenses (i.e. more download bandwidth, more website content, more newsletter content… which all take time from us) it would be quite unfair to have both versions for only $45 (there are software that offer both versions in single registration but compare the prices - such soft costs way more read like $400 or so… !)
therefore Mac version registration will be separate, but, we may have bundle registration although this is not decided yet (i.e. you register both versions for special, lower price than price of both separate registrations).