MultiMap / Reduce - Counts = 0?

I want to create an index for a query, I want to return to my view a list of Audio items along with statistics for these items, which are TotalDownloads & TotalPlays.

Here are my relevant docs:

Audio
 - Id
 - ArtistName
 - Name

AudioCounter
 - AudioId
 - Type
 - DateTime

Here is my current Index:

public class AudioWithCounters : AbstractMultiMapIndexCreationTask<AudioWithCounters.AudioViewModel>
    {
        public class AudioViewModel
        {
            public string Id { get; set; }
            public string ArtistName { get; set; }
            public string Name { get; set; }
            public int TotalDownloads { get; set; }
            public int TotalPlays { get; set; }
        }

        public AudioWithCounters()
        {
            AddMap<Audio>(audios => from audio in audios
                                    select new
                                    {
                                        Id = audio.Id,
                                        ArtistName = audio.ArtistName,
                                        Name = audio.Name,
                                        TotalDownloads = 0,
                                        TotalPlays = 0
                                    });

            AddMap<AudioCounter>(counters => from counter in counters
                                             where counter.Type == Core.Enums.Audio.AudioCounterType.Download
                                    select new
                                    {
                                        Id = counter.AudioId,
                                        ArtistName = (string)null,
                                        Name = (string)null,
                                        TotalDownloads = 1,
                                        TotalPlays = 0
                                    });

            AddMap<AudioCounter>(counters => from counter in counters
                                             where counter.Type == Core.Enums.Audio.AudioCounterType.Download
                                             select new
                                             {
                                                 Id = counter.AudioId,
                                                 ArtistName = (string)null,
                                                 Name = (string)null,
                                                 TotalDownloads = 0,
                                                 TotalPlays = 1
                                             });

            Reduce = results => from result in results
                                group result by result.Id
                                    into g
                                    select new
                                    {
                                        Id = g.Key,
                                        ArtistName = g.Select(x => x.ArtistName).Where(x => x != null).First(),
                                        Name = g.Select(x => x.Name).Where(x => x != null).First(),
                                        TotalDownloads = g.Sum(x => x.TotalDownloads),
                                        TotalPlays = g.Sum(x => x.TotalPlays)
                                    };
        }
    }

However, my TotalDownloads & TotalPlays are always 0 even though there should be data in there. What am I doing wrong?

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