To synchronize CDJs, you can use the Pro DJ Link feature which allows you to connect multiple CDJs together using Ethernet cables. This feature enables you to sync the tempo and playback of the CDJs so that they play in perfect harmony. Simply connect the CDJs using Ethernet cables, enable the Pro DJ Link feature on each CDJ, and then use the sync button to synchronize the tempo and playback. This will ensure that your music flows seamlessly between the CDJs. **

Gemini is not typically known as a top-tier brand for CDJs. While they offer more budget-friendly options, they may not have the same level of quality, durability, and features as other higher-end brands like Pioneer DJ. If you are a beginner or looking for a more affordable option, Gemini could be a suitable choice. However, if you are a professional DJ or looking for top-notch performance, you may want to consider investing in a different brand. **

CDJs can be used as controllers by connecting them to a laptop or computer via USB. This allows the CDJs to communicate with DJ software such as Serato or Traktor, enabling the DJ to control the software using the CDJs' jog wheels, buttons, and knobs. By using CDJs as controllers, DJs can take advantage of the tactile feel and familiarity of the CDJ interface while still having access to the advanced features and capabilities of DJ software. **

CDJs can be used as controllers by connecting them to a computer or DJ software using a USB cable. Once connected, the CDJs can be used to control the playback of music in the DJ software, including features such as play, pause, cue, and pitch control. Additionally, the CDJs can be mapped to control other functions within the software, such as effects, loops, and hot cues, allowing for a more customized and versatile DJ setup. Some DJ software also has specific settings or modes for using CDJs as controllers, making it easier to integrate them into a digital DJ setup. **

To analyze tracks in rekordbox for CDJs, first import your music library into rekordbox. Once your tracks are imported, select the tracks you want to analyze and right-click to access the "analyze" option. This will analyze the tracks for beatgrid, BPM, and key information, which will help you to easily mix and transition between tracks when using CDJs. Once the tracks are analyzed, you can export them to a USB drive and use them with CDJs for seamless mixing. **

To connect your CDJs and DJX900 to your laptop, you will need to use USB cables. First, connect the CDJs to your laptop using USB cables. Then, connect the DJX900 mixer to your laptop using another USB cable. Make sure to install any necessary drivers or software for your equipment on your laptop. Once everything is connected, you should be able to control your music software using the CDJs and DJX900 mixer. **

Yes, 2 CDJs or XDJ's can operate with a 4-deck mixer. The CDJs or XDJ's can be connected to the inputs of the 4-deck mixer, allowing the DJ to control and mix the audio from the CDJs or XDJ's using the mixer's controls. This setup allows for more flexibility and creativity in mixing and blending different tracks together. **

One can exchange coins for banknotes at various places such as banks, currency exchange offices, and some post offices. Many banks offer coin counting machines where customers can deposit coins and receive banknotes in return. Some supermarkets and retail stores also have coin exchange machines that allow customers to convert their coins into vouchers or gift cards. Additionally, some charities and organizations accept coin donations and provide banknotes in exchange. **