diff --git a/Interface/Harp.Olfactometer/ConfigureOdorMix.cs b/Interface/Harp.Olfactometer/ConfigureOdorMix.cs
new file mode 100644
index 0000000..a9b20d6
--- /dev/null
+++ b/Interface/Harp.Olfactometer/ConfigureOdorMix.cs
@@ -0,0 +1,219 @@
+using Bonsai;
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Reactive.Linq;
+using Bonsai.Harp;
+using System.Collections.Generic;
+
+
+namespace Harp.Olfactometer
+{
+    /// <summary>
+    /// Represents an operator that generates a sequence of Harp messages to
+    /// configure the odor mixture in the olfactometer as corresponding odor
+    /// valves.
+    /// The configuration will set the target flow for each channel, assuming
+    /// a constant target full flow, target odor flow and percentage of each odor.
+    /// </summary>
+    [Description("Generates a sequence of Harp messages to configure an odor mixture.")]
+
+    public class ConfigureOdorMix : Source<HarpMessage>
+    {
+        /// <summary>
+        /// Gets or sets the concentration of Channel0.
+        /// </summary>
+        [Range(0, 1)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("Odor dilution percentage for channel 0.")]
+        public float PercentageChannel0 { get; set; } = 0;
+
+        /// <summary>
+        /// Gets or sets the concentration of Channel1.
+        /// </summary>
+        [Range(0, 1)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("Odor dilution percentage for channel 1.")]
+        public float PercentageChannel1 { get; set; } = 0;
+
+        /// <summary>
+        /// Gets or sets the concentration of Channel2.
+        /// </summary>
+        [Range(0, 1)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("Odor dilution percentage for channel 2.")]
+        public float PercentageChannel2 { get; set; } = 0;
+
+        /// <summary>
+        /// Gets or sets the concentration of Channel3.
+        /// </summary>
+        [Range(0, 1)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("Odor dilution percentage for channel 3. This Value will be ignored if Channel3AsCarrier is set to True.")]
+        public float PercentageChannel3 { get; set; } = 0;
+
+
+        public bool channel3AsCarrier = false;
+        /// <summary>
+        /// Gets or sets the operation mode of Channel3.
+        /// </summary>
+        [Description("Specifies if Channel3 should be used as an odor or carrier channel. If True, the flow value value of Channel3 will be set to TargetTotalFlow.")]
+        public bool Channel3AsCarrier
+        {
+            get { return channel3AsCarrier; }
+            set
+            {
+                channel3AsCarrier = value;
+                PercentageChannel3 = channel3AsCarrier ? float.NaN : 0;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the target flow rate for all odor channels.
+        /// </summary>
+        [Range(0, 100)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("The target odor flow for each channel, assuming PercentageChannelX = 1.")]
+        public int TargetOdorFlow { get; set; } = 100;
+
+
+        /// <summary>
+        /// Gets or sets the target total flow rate.
+        /// </summary>
+        [Range(0, 100)]
+        [Editor(DesignTypes.SliderEditor, DesignTypes.UITypeEditor)]
+        [Description("The total target flow rate. This value will be used to calculate the flow rate of the carrier automatically.")]
+        public int TargetTotalFlow { get; set; } = 1000;
+
+        private List<HarpMessage> ConstructMessages()
+        {
+            var adjustedOdorFlow0 = (int)(TargetOdorFlow * PercentageChannel0);
+            var adjustedOdorFlow1 = (int)(TargetOdorFlow * PercentageChannel1);
+            var adjustedOdorFlow2 = (int)(TargetOdorFlow * PercentageChannel2);
+            var adjustedOdorFlow3 = channel3AsCarrier ? 0 : (int)(TargetOdorFlow * PercentageChannel3);
+            var carrierFlow = TargetOdorFlow - (adjustedOdorFlow0 + adjustedOdorFlow1 + adjustedOdorFlow2 + adjustedOdorFlow3);
+
+            var channelsTargetFlow = ChannelsTargetFlow.FromPayload(MessageType.Write, new ChannelsTargetFlowPayload(
+                adjustedOdorFlow0,
+                adjustedOdorFlow1,
+                adjustedOdorFlow2,
+                channel3AsCarrier ? TargetOdorFlow : adjustedOdorFlow3,
+                carrierFlow));
+
+            adjustedOdorFlow3 = channel3AsCarrier ? TargetOdorFlow : adjustedOdorFlow3;
+            var odorValveState = OdorValveState.FromPayload(MessageType.Write,
+            (
+                (adjustedOdorFlow0 > 0 ? OdorValves.Valve0 : OdorValves.None) |
+                (adjustedOdorFlow1 > 0 ? OdorValves.Valve1 : OdorValves.None) |
+                (adjustedOdorFlow2 > 0 ? OdorValves.Valve2 : OdorValves.None) |
+                (adjustedOdorFlow3 > 0 ? OdorValves.Valve3 : OdorValves.None)
+            ));
+
+            return new List<HarpMessage> { channelsTargetFlow, odorValveState };
+        }
+
+        private List<HarpMessage> ConstructMessages(int odorIndex, double concentration)
+        {
+
+            var adjustedOdorFlow0 = 0;
+            var adjustedOdorFlow1 = 0;
+            var adjustedOdorFlow2 = 0;
+            var adjustedOdorFlow3 = 0;
+
+            switch (odorIndex)
+            {
+                case 0:
+                    adjustedOdorFlow0 = (int)(TargetOdorFlow * concentration);
+                    break;
+                case 1:
+                    adjustedOdorFlow1 = (int)(TargetOdorFlow * concentration);
+                    break;
+                case 2:
+                    adjustedOdorFlow2 = (int)(TargetOdorFlow * concentration);
+                    break;
+                case 3:
+                    if (channel3AsCarrier)
+                    {
+                        throw new Exception("Channel 3 is set as carrier. Cannot set flow for this channel.");
+                    }
+                    adjustedOdorFlow3 = (int)(TargetOdorFlow * concentration);
+                    break;
+                default:
+                    throw new Exception("Invalid channel number. Must be between 0 and 3.");
+            }
+
+            var carrierFlow = TargetOdorFlow - (adjustedOdorFlow0 + adjustedOdorFlow1 + adjustedOdorFlow2 + adjustedOdorFlow3);
+
+            var channelsTargetFlow = ChannelsTargetFlow.FromPayload(MessageType.Write, new ChannelsTargetFlowPayload(
+                adjustedOdorFlow0,
+                adjustedOdorFlow1,
+                adjustedOdorFlow2,
+                channel3AsCarrier ? TargetOdorFlow : adjustedOdorFlow3,
+                carrierFlow));
+
+            adjustedOdorFlow3 = channel3AsCarrier ? TargetOdorFlow : adjustedOdorFlow3;
+            var odorValveState = OdorValveState.FromPayload(MessageType.Write,
+            (
+                (adjustedOdorFlow0 > 0 ? OdorValves.Valve0 : OdorValves.None) |
+                (adjustedOdorFlow1 > 0 ? OdorValves.Valve1 : OdorValves.None) |
+                (adjustedOdorFlow2 > 0 ? OdorValves.Valve2 : OdorValves.None) |
+                (adjustedOdorFlow3 > 0 ? OdorValves.Valve3 : OdorValves.None)
+            ));
+
+            return new List<HarpMessage> { channelsTargetFlow, odorValveState };
+        }
+
+
+        /// <summary>
+        /// Generates an observable sequence of Harp messages to configure the
+        /// odor mixture whenever the input sequence produces an element.
+        /// </summary>
+        /// <typeparam name="TSource">
+        /// The type of the elements in the <paramref name="source"/> sequence.
+        /// </typeparam>
+        /// <param name="source">
+        /// The sequence containing the notifications used to emit new configuration
+        /// messages.
+        /// </param>
+        /// <returns>
+        /// A sequence of <see cref="HarpMessage"/> objects representing the commands
+        /// needed to fully configure odor mixture.
+        /// </returns>
+        public IObservable<HarpMessage> Generate<TSource>(IObservable<TSource> source)
+        {
+            return source.SelectMany(value => ConstructMessages().ToObservable());
+        }
+
+        /// <summary>
+        /// Generates an observable sequence of Harp messages to configure the
+        /// odor mixture.
+        /// </summary>
+        /// <returns>
+        /// A sequence of <see cref="HarpMessage"/> objects representing the commands
+        /// needed to fully configure the PWM feature.
+        /// </returns>
+        public override IObservable<HarpMessage> Generate()
+        {
+            return ConstructMessages().ToObservable();
+        }
+
+        /// <summary>
+        /// Generates an observable sequence of Harp messages to configure the
+        /// odor mixture whenever the input sequence produces an element. The
+        /// tuple values will be used to target a specific channel index (Item1)
+        /// and set its concentration (Item2).
+        /// </summary>
+        /// <param name="source">
+        /// The sequence containing a tuple with the channel index and concentration.
+        /// </param>
+        /// <returns>
+        /// A sequence of <see cref="HarpMessage"/> objects representing the commands
+        /// needed to fully configure odor mixture.
+        /// </returns>
+        public IObservable<HarpMessage> Generate(IObservable<Tuple<int, double>> source)
+        {
+            return source.SelectMany(value => ConstructMessages(value.Item1, value.Item2));
+        }
+    }
+
+}