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                        -(void) downloadTabWithTranspose
{
	if (coreTextSupported) // всегда NO
	{
		return;
	}
	
	self.tabData = [self prepareChordsUrls:self.tabData]; 
}
// Парой сотней строк ниже
-(NSString *) prepareChordsUrls:(NSString *) source
{
    NSString *regex = @"<font color=\"#.{6}\" class=\"chord\">(.*?)</font>";
    NSMutableString *newHtml = [NSMutableString string];
    NSRange range = NSMakeRange(0, 0);
    int start = 0;
	
    while (range.location != NSNotFound)
    {
        int location = range.location + range.length;
        int length = [source length] - range.location - range.length;
        range = NSMakeRange(location, length);
        NSError *error = NULL;
        range = [source rangeOfRegex:regex options:RKLNoOptions inRange:range capture:0 error:&error];
		
        if (range.location != NSNotFound)
        {
            NSString *found = [source substringWithRange:range];
            found = [found substringWithRange:[found rangeOfRegex:@"\\>(.*)\\<"]];
            found = [found substringWithRange:NSMakeRange(1, [found length] - 2)];
			
            [newHtml appendString:[source substringWithRange:NSMakeRange(start, range.location - start)]];
            start = range.location + range.length;
			
            [newHtml appendFormat:@"<a chord=\"%@\" href=\"chord:%@\">%@</a>", found, found, found];
        }
		
    }
	
    [newHtml appendString:[source substringWithRange:NSMakeRange(start, [source length] - start)]];
    return newHtml;
}
                                 
        
Как же без Наблюдателя тут обойтись?
:)))