Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Nady MM-14FX 4-Channel Microphone Mixer with integrated echo effect – ¼” Inputs & output – Delay time & Depth controls
Product description: Mix up to 4 microphones together and add echo with this high-quality, compact and durable audio mixer, The MM-14FX by Nady Systems is a great mini mixer for dynamic microphones. Versatile and highly portable, this little workhorse features four mono microphone inputs with individual volume controls, plus built-in echo effects DSP with delay time and depth controls for the ultimate mixing effects. Although small in size, the MM-14FX provides up to 50dB of gain per channel with low distortion, a high signal-to-noise ratio, and a wide frequency response to deliver all of the details in your audio., Connect the unbalanced output directly to your PA or recording device for ultra-clean audio. Karaoke, performances, recording, presentations, classes, the applications are endless The MM-14FX is a perfect front-end solution wherever there is a need for dynamic microphones. Eliminate the need for bulkier, more expensive mixers, and take the MM-14FX anywhere with you with its 9VDC operation using either a 9V alkaline battery or the optional PAD-1 AC/DC external adapter., Specifications Input Impedance : 5k Maximum Input : -13dBm Sensitivity : -45dBm Output Impedance : 800 Maximum Output : +6.5dBm Max Gain : 49.1dB Frequency Response : 20Hz 18kHz (3dB) THD + Noise : 0.09% S/N : -78dB Noise Floor : 300uV Current Drain : 35mA 9V Battery Life : up to 20 hours Power Requirements : 9V battery or optional PAD-1 AC/DC adapter
Product feature: 4 mono 1/4" Microphone Inputs with individual volume controls mixed to one single 1/4" line level output.this mixer is not a stand-alone device, it should be connected to the amplifier, Compact design with a heavy-duty steel construction, smooth-turn ultra-stable pots, and high-quality jacks for lasting durability, The mixer delivers high-quality audio with up to 50dB of gain per channel, low distortion, a high signal-to-noise ratio, and a wide frequency response to bring out all of the details in your audio, Decay time and depth control knobs let you adjust the built-in echo DSP to simulate the decay reverb of rooms, halls, and stadiums, The front panel has an on/off switch with an indicator LED. The mixer can operate on a 9V battery, or via an optional external AC/DC adapter for terrific versatility, Though it can be used in many applications, the MM-14FX is designed for use with dynamic microphones. If using otherwise, please be aware that significant volume increases may incur some signal distortion.
Product price: $7.99
Product brand: Nady
Target attributes: Number of Buses
Answer: attribute: number of buses
value: None
source: None