I am currently doing my solar charger with storage level indication through 7segment and an output voice of storage level. I am currently facing problem in the sound synthesizer circuit where i need to find the suitable chip for my project. I have read up some chip such as AD74111, AD7880, AD7868 and BU6922KV. All these chip are not suitable to be used and i have out of resource to find the chip. Is there any other options that i can go on? I need to find a way to pronounce the sound correctly using any chip that available.